Running shoes are sold on their technology, and every brand brands its own version of it: the foam in the midsole, the rubber on the outsole and the curved geometry that rolls you forward. This hub is a plain-English encyclopedia of the named foams, grip compounds and rocker systems you see on spec sheets across the major running brands. Each entry says who makes it, what it is and how it feels or works -- no jargon, no hype.

Midsole foams

PureGEL

Softer GEL cushioning unit placed within FlyteFoam to absorb landings, not a standalone midsole foam.

What it is

PureGEL is ASICS's midsole foam, built on silicone-gel.

How it feels

Soft, shock-absorbing at heel strike; smooths landings rather than adding bounce or propulsion.

FF BLAST

Lighter, bouncier next-generation FlyteFoam blending EVA and OBC for soft, agile cushioning.

What it is

FF BLAST is ASICS's midsole foam, built on EVA.

How it feels

Soft and lively with mild bounce; balanced daily-trainer feel, not overtly responsive.

Where it sits

In ASICS's range it typically sits above FlyteFoam.

FF BLAST+

Approximately 19 percent lighter EVA evolution of FF BLAST with bio-based content.

What it is

FF BLAST+ is ASICS's midsole foam, built on EVA.

How it feels

Softer and more cushioned than FF BLAST while staying light and stable; comfortable long-run feel.

Where it sits

In ASICS's range it typically sits above FF BLAST.

FF BLAST TURBO

ASICS premium nylon/PEBA-based race foam, lighter and bouncier than EVA FF BLAST tiers.

What it is

FF BLAST TURBO is ASICS's midsole foam, built on PEBA.

How it feels

Light, energetic and springy; firmer and more stable than rivals, propulsive at tempo and race pace.

Where it sits

In ASICS's range it typically sits above FF BLAST+.

FlyteFoam

ASICS original proprietary EVA copolymer midsole with organic fibers for cushioning and durability.

What it is

FlyteFoam is ASICS's midsole foam, built on EVA.

How it feels

Firm, durable and supportive; modest bounce, prioritizes longevity over plushness.

FlyteFoam Blast

Bouncier branch of FlyteFoam family; effectively the full name for the FF BLAST line.

What it is

FlyteFoam Blast is ASICS's midsole foam, built on EVA.

How it feels

Soft, light and agile with positive energy return; livelier than standard FlyteFoam.

Where it sits

In ASICS's range it typically sits above FlyteFoam.

Cushlon

ASICS legacy EVA-based midsole foam used for cushioned, durable rides below the flagship lines.

What it is

Cushlon is ASICS's midsole foam, built on EVA.

How it feels

Soft and cushioned with a stable, durable feel; modest responsiveness, comfort-oriented.

FuelCell

New Balance high-energy performance foam, historically nitrogen-infused TPU, newer versions PEBA or PEBA/EVA.

What it is

FuelCell is New Balance's midsole foam, built on TPU.

How it feels

Bouncy, responsive and propulsive; energetic toe-off favored for tempo and racing.

Where it sits

In New Balance's range it typically sits above Fresh Foam.

Fresh Foam

New Balance established plush EVA-blend cushioning introduced in 2014.

What it is

Fresh Foam is New Balance's midsole foam, built on EVA.

How it feels

Soft, cushioned and comfortable; less springy and heavier, built for easy miles.

Fresh Foam X

Upgraded Fresh Foam with softer, more cushioned and slightly more responsive EVA formulation.

What it is

Fresh Foam X is New Balance's midsole foam, built on EVA.

How it feels

Plush and soft with improved energy return over Fresh Foam; smooth max-cushion ride.

Where it sits

In New Balance's range it typically sits above Fresh Foam.

DNA Loft

Brooks plush midsole blending EVA, rubber and air; v3 is nitrogen-infused supercritical EVA.

What it is

DNA Loft is Brooks's midsole foam, built on EVA.

How it feels

Soft, plush and smooth; v3 adds lightness and mild responsiveness while staying cushioned.

DNA Flash

Brooks lightweight nitrogen-infused EVA cushioning built for speed and snappier response.

What it is

DNA Flash is Brooks's midsole foam, built on EVA.

How it feels

Light, snappy and more responsive than DNA Loft; firmer, energetic ride for faster paces.

Where it sits

In Brooks's range it typically sits above DNA Loft.

Nitro Foam

PUMA nitrogen-infused EVA daily-trainer foam, softer and livelier than plain EVA.

What it is

Nitro Foam is PUMA's midsole foam, built on EVA.

How it feels

Cushioned with mild bounce; resists cold-stiffening, comfortable daily ride below the carbon plate.

Nitro Elite

PUMA premium nitrogen-infused race foam; early PEBA/EVA, newer versions A-TPU.

What it is

Nitro Elite is PUMA's midsole foam, built on PEBA.

How it feels

Light, bouncy and highly responsive; race-ready propulsion, though early PEBA stiffens notably in cold.

Where it sits

In PUMA's range it typically sits above Nitro Foam.

FloatPro

Reebok lightweight EVA-based foam used in entry and lifestyle/training models.

What it is

FloatPro is Reebok's midsole foam, built on EVA.

How it feels

Light and reasonably cushioned; basic EVA feel, neither notably bouncy nor premium responsive.

Floatride Energy

Reebok expanded-pellet TPU (e-TPU) super-foam, comparable concept to adidas Boost.

What it is

Floatride Energy is Reebok's midsole foam, built on TPU.

How it feels

Responsive, springy and durable; lighter and bouncier than standard EVA, well-rounded value ride.

Where it sits

In Reebok's range it typically sits above FloatPro.

Floatride Fuel

Reebok entry-level EVA-type cushioning used in budget training and running shoes.

What it is

Floatride Fuel is Reebok's midsole foam, built on EVA.

How it feels

Basic, firm-to-moderate EVA cushioning; durable but not springy or particularly soft.

Boost

adidas iconic expanded-TPU (e-TPU) pellet foam, the original super-foam, prized for durability.

What it is

Boost is adidas's midsole foam, built on TPU.

How it feels

Bouncy, energetic and extremely durable; dense and slightly heavy but consistent energy return.

Lightstrike

adidas lightweight foam, evolved from TPU-based original to EVA in Lightstrike 2.0.

What it is

Lightstrike is adidas's midsole foam, built on EVA.

How it feels

Firm, light and stable; controlled rather than soft, supportive for tempo and stability work.

Lightstrike Pro

adidas premium racing super-foam delivering high energy return for carbon-plated race shoes.

What it is

Lightstrike Pro is adidas's midsole foam, built on TPEE.

How it feels

Soft, bouncy and highly responsive; lively race feel with strong rebound and propulsion.

Where it sits

In adidas's range it typically sits above Lightstrike.

Dreamstrike+

adidas PEBA-based foam for premium daily trainers, light with high cushioning.

What it is

Dreamstrike+ is adidas's midsole foam, built on PEBA.

How it feels

Light and well-cushioned with decent return; smoother than Lightstrike but less explosive than Lightstrike Pro.

Where it sits

In adidas's range it typically sits above Lightstrike.

ZoomX

Nike flagship supercritical PEBA (Pebax) race foam delivering top-tier energy return.

What it is

ZoomX is Nike's midsole foam, built on PEBA.

How it feels

Extremely soft, light and bouncy; approx 85 percent energy return, propulsive marathon-race feel.

Where it sits

In Nike's range it typically sits above ReactX.

ReactX

Nike durable everyday foam, successor to React with 13 percent more energy return and lower carbon footprint.

What it is

ReactX is Nike's midsole foam, built on TPE.

How it feels

Responsive yet stable and durable; firmer everyday ride, more energetic than original React.

Where it sits

In Nike's range it typically sits above React Foam.

React Foam

Nike original durable daily foam blending TPE and EVA for balanced cushioning.

What it is

React Foam is Nike's midsole foam, built on TPE.

How it feels

Smooth, balanced and durable; moderately responsive, approx 13 percent less return than ReactX.

Mizuno Enerzy

Mizuno EVA-based cushioning foam, softer and more energetic than its previous midsole materials.

What it is

Mizuno Enerzy is Mizuno's midsole foam, built on EVA.

How it feels

Soft with good rebound and durability; approx 17 percent softer and 15 percent more return than prior foam.

ZipFoam

Topo Athletic signature EVA/TPU blend balancing responsiveness and durability.

What it is

ZipFoam is Topo Athletic's midsole foam, built on EVA.

How it feels

Moderately responsive and very durable; heavier and not supercritical, firms up notably in cold.

EGO Foam

Altra original responsive midsole foam (often described TPU-based) balancing bounce and durability.

What it is

EGO Foam is Altra's midsole foam, built on TPU.

How it feels

Springy and responsive with solid durability; energetic but not as soft as the Pro/Max variants.

EGO MAX

Altra max-cushion EGO compound for road shoes, plusher and more propulsive than base EGO.

What it is

EGO MAX is Altra's midsole foam, built on EVA.

How it feels

Plush, cushioned and reasonably responsive; smooth long-run ride with good impact protection.

Where it sits

In Altra's range it typically sits above EGO Foam.

EGO PRO

Altra lightest, most cushioned nitrogen-infused TPE-based race/tempo super-foam.

What it is

EGO PRO is Altra's midsole foam, built on TPE.

How it feels

Soft yet trampoline-like rebound; light and propulsive, the most energetic Altra foam for speed.

Where it sits

In Altra's range it typically sits above EGO MAX.

Outsole and grip rubber

SurfaceCTRL

The North Face proprietary trail outsole rubber used in the VECTIV system instead of Vibram.

What it is

SurfaceCTRL is The North Face's trail outsole rubber, tuned for trail use.

On the ground

Excellent grip on dry rock, dirt and roots; firm ~90 HC compound favors durability over wet-rock stickiness.

ASICSGRIP

Softer advanced-polymer rubber for confident grip on dry and wet roads and turns.

What it is

ASICSGRIP is ASICS's sticky outsole rubber, tuned for road use.

On the ground

Strong wet/dry traction with good durability; often paired with AHAR+ at high-wear zones for balance.

PUMAGRIP

Durable PUMA rubber widely rated among the stickiest in the business on wet or dry.

What it is

PUMAGRIP is PUMA's sticky outsole rubber, tuned for road use.

On the ground

Excellent multi-surface traction with strong durability; consistent grip even on budget models. PUMAGRIP ATR variant targets trail.

Michelin Outsole

Tire-maker Michelin's footwear rubber supplied to brands like Under Armour, Mizuno and Babolat.

What it is

Michelin Outsole is Michelin's outsole rubber, tuned for road use.

On the ground

Superior wet/icy grip and oil-resistant hard-wearing durability, with tread patterns derived from motorbike tire design.

Vibram Megagrip

High-performance Vibram rubber compound with strong grip on wet and dry terrain.

What it is

Vibram Megagrip is Vibram's sticky outsole rubber, tuned for trail use.

On the ground

Unparalleled wet/dry grip plus high durability for long-distance trail, hiking and trekking; the gold-standard trail compound.

Vibram Litebase

Construction technology that thins the outsole base, not a grip compound itself.

What it is

Vibram Litebase is Vibram's outsole construction technology -- a thinned base layer under the rubber, not a grip compound in itself.

What it does

Cuts outsole weight up to 30% and thickness up to 50% for responsiveness, while keeping full lug performance.

Vibram Traction Lug

Vibram lug-shape design concept that optimizes the geometry of the tread for traction.

What it is

Vibram Traction Lug is Vibram's outsole lug design -- a tread-geometry concept rather than a rubber compound.

What it does

Raises traction up to 25% and contact surface area up to 50%, adding stability; a design tech, not a compound.

FriXion

La Sportiva's family of custom rubber compounds spanning mountain running to climbing.

What it is

FriXion is La Sportiva's sticky outsole rubber, tuned for trail use.

On the ground

Tunable grip-vs-durability across 5 compounds (Black sticky, White/XF2.0 stickiest, Blue for mud, Eco recycled).

RoadTack Rubber

Brooks road outsole blending recycled silica with durable carbon rubber at high-wear zones.

What it is

RoadTack Rubber is Brooks's high-abrasion outsole rubber, tuned for road use.

On the ground

Multi-surface grip (~0.67 traction rating) with strong durability and lower environmental footprint; secure on wet and light snow.

XT-900

Saucony premium carbon rubber placed at high-wear heel and forefoot zones for traction.

What it is

XT-900 is Saucony's high-abrasion outsole rubber for high-wear zones.

On the ground

Reliable wet/dry grip with minimal wear over high mileage (~87.5 HC); strategic coverage keeps weight low.

AHAR

ASICS High Abrasion Rubber, about twice as durable as conventional outsole rubber.

What it is

AHAR is ASICS's high-abrasion outsole rubber for high-wear zones.

On the ground

Roughly 2x abrasion resistance using tire-derived rubber; placed in high-wear zones to extend shoe lifespan.

AHAR+

Higher-durability tier of ASICS AHAR, about three times as resistant as conventional rubber.

What it is

AHAR+ is ASICS's high-abrasion outsole rubber for high-wear zones.

On the ground

Roughly 3x abrasion resistance (vs AHAR's ~2x); used at extreme-wear heel/toe areas without adding much weight.

Geometry, rockers and support

CloudWave

Mizuno's concave Wave plate for softer heel landings and added energy return.

What it is

CloudWave is Mizuno's cushioning plate.

What it does

Concave thermoplastic Wave plate under heel/midfoot flexes to collapse the midsole for a softer landing without grounding out.

Wave Plate

Mizuno's signature wave-shaped plate balancing cushioning and stability.

What it is

Wave Plate is Mizuno's cushioning plate.

What it does

Thermoplastic wave-shaped plate in the midsole disperses impact evenly across the sole, giving both cushioning and stability.

MetaRocker

Hoka's curved rocker geometry that rolls the foot smoothly through each stride.

What it is

MetaRocker is Hoka's rocker geometry.

What it does

Curved midsole with low drop creates a fulcrum/rocking-chair effect to guide the foot's roll from landing to toe-off.

GUIDESOLE

ASICS curved stiff-forefoot rocker that saves energy at the ankle.

What it is

GUIDESOLE is ASICS's rocker geometry.

What it does

Curved sole with a stiff forefoot reduces ankle-joint flexion and energy loss, encouraging an efficient heel-to-toe rocking motion.

GuideRails

Brooks holistic support that limits excess motion without correcting your stride.

What it is

GuideRails is Brooks's support system.

What it does

Midsole inserts on inner and outer walls limit excess heel/knee motion only when needed, like bowling bumpers, without posts.