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Engineered woven upper: Offers advanced stretch, ventilation, and durability

Tongue wing construction: Added stretch helps improve the fit while reducing tongue movement

Gusseted tongue wing fit system improves the midfoot fit and reduces tongue sliding: Improves the midfoot fit and reduces tongue sliding

FF BLAST PLUS ECO cushioning: Made with approximately 20% bio-based content and helps provide cloud-like comfort

Trampoline-inspired outsole design: Helps provide a more responsive bounce back

Max Air unit adds lasting cushioning and is visible through 3 windows for truly modern look.

Elongated design lines honor Air Max 90 while modernizing these kicks in fresh way.

Stitched overlays add heritage styling and durability. Padded, low-cut collar looks sleek and feels comfortable.

Foam midsole feels soft and plush. Outsole features rubber details for traction and durability.

THIS MEN'S SHOE IS FOR: The Glycerin GTS 21 is for runners who think there is no such thing as too much cushioning but seek additional support from our trusted GuideRails holistic support system. This Brooks Glycerin GTS 21 has been granted the APMA Seal of Acceptance. Predecessor: Brooks Glycerin GTS 20.

GREAT SUPPORT: The Glycerin GTS 21 is the more supportive version of the Glycerin 20. The innovative GuideRails holistic support system supports your body in its natural motion path while keeping excess movement in check. Ideal for road running, cross training, the gym or wherever you might want to take them!

PLUSH IMPROVED FIT: The plush feel of an internal stretch bootie surrounds your foot and moves and expands with your stride. The newly engineered warp knit upper is breathable and allows for a flexible, accommodating fit while staying soft against the foot.

SUPREME SOFTNESS: The ultimate in softness and supreme comfort, designed for runners who want pillowy soft cushioning. The Glycerin GTS 21 with nitrogen-infused DNA LOFT v3 cushioning offers supreme softness optimized to be lightweight, responsive, and durable for plush comfort.

SMOOTH, STABLE TRANSITIONS: The broad platform stabilizes your foot and promotes smooth heel-to-toe transitions for a supremely soft on-the-run experience.

Engineered mesh upper: Improves breathability

Knit heel pull tab: For easy on and off

4D GUIDANCE SYSTEM feature: Helps create adaptive stability for a more balanced stride

Rearfoot PureGEL technology: Helps provide lightweight cushioning and softer landings

FF BLAST PLUS ECO cushioning is made with approximately 20% bio-based content and helps provide cloud-like comfort: OrthoLite X-55 sockliner

THIS MEN'S SHOE IS FOR: For runners seeking a versatile springy performance shoe with sleek, sporty style for workouts, weekends, and anything in between. Predecessor: Revel 6.

COMFORTABLE RIDE: Adaptable DNA midsole cushioning technology that adapts to your stride, weight, and speed to help protect you by deflecting impact away from your body.

RESPONSIVE FEEL: The bottom of the shoe is constructed to provide enhanced energy return through all your activities.

COMFORT: Soft tongue and updated comfort collar design provides all-day comfort and a plush feeling against your foot.

GUIDANCE LINE technology to help deliver a smoother stride:

GEL technology cushioning in the rearfoot of the midsole creates better shock absorption during the landing phase of your stride:

AHAR technology helps reduce wear in high-contact areas of the outsole:

Lightweight, breathable knit upper for ultimate comfort against the foot throughout your runs

TPU external heel counter provides lockdown support & fit

Ortholite deluxe sockliner for maximum step-in comfort

Responsive UA HOVR cushioning reduces impact, returns energy & helps propel you forward

Carbon rubber in heel & toe-off for added traction & durability & blown rubber forefoot for energy return

Offset: 8mm

Weight: 9.9 oz.

Lace type: Standard tie

NEUTRAL: For runners who need a balance of flexibility & cushioning"

FuelCell foam delivers a propulsive feel to help drive you forward

ENCAP midsole cushioning combines lightweight foam with a durable polyurethane rim to deliver all-day support

Suede and mesh upper

Lace-up closure for a secure fit

Modernizes the iconic 990 silhouette

Engineered mesh upper with seamless forefoot for comfort & breathability

External heel counter for lightweight structure & added lockdown

3D-molded sockliner cradles the foot for enhanced step-in comfort

Responsive UA HOVR cushioning reduces impact, returns energy & helps propel you forward

Combination of carbon rubber & blown rubber in the outsole for strategic durability & lightweight rebound

Updated outsole design has flexibility where you need it & disperses impact efficiently for a smooth ride

Offset: 8mm

Weight: 9.9 oz.

Lace type: Standard tie

NEUTRAL: For runners who need a balance of flexibility & cushioning