{"product_id":"brooks-glycerin-gts-21-supportive-running-shoe-plush-support-road","title":"Brooks Glycerin GTS 21 Supportive Running Shoe - Plush Support Road","description":"\u003cp\u003eIn this review of the Brooks Glycerin GTS 21 Supportive Running Shoe the bottom line is simple: runners who want the maximum in cushioning plus targeted support will appreciate these shoes. The Glycerin GTS 21 combines nitrogen-infused DNA LOFT v3 foam for a pillowy ride with Brooks' GuideRails holistic support system to keep excess motion in check. The fit is updated with a warp knit upper and internal stretch bootie that feels plush and adapts to the foot, so the shoe reads as both supremely soft and reliably supportive on road runs and in everyday training.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuideRails holistic support:\u003c\/strong\u003e Provides guided stability to limit excess movement while letting the foot move along its natural path for safer, more comfortable runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDNA LOFT v3 cushioning:\u003c\/strong\u003e Nitrogen-infused foam creates a very soft, responsive midsole that delivers plush comfort without feeling overly squishy.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarp knit upper:\u003c\/strong\u003e Breathable, flexible fabric gives an accommodating fit that stays soft against the foot and adapts during the stride.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal stretch bootie:\u003c\/strong\u003e Surrounds the foot for a snug, plush fit that expands with motion to reduce hotspots and improve overall comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad platform:\u003c\/strong\u003e Stabilizes the foot for smooth heel-to-toe transitions and consistent underfoot support on road surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe Glycerin GTS 21 is best for road runners and gym goers who prioritize maximum cushioning but still need structured support, including people who experience foot pain or have issues with knee discomfort because the shoe helps absorb impact. Runners with wider feet will likely appreciate the accommodating knit upper and plush internal bootie.\u003c\/p\u003e\u003cp\u003eThose who prefer a very firm, minimal, or racing-oriented shoe should look elsewhere, as this model emphasizes softness and stability rather than lightweight speed or barefoot feel. If longevity under heavy mileage is the top concern for an aggressive training calendar, some users reported mixed durability impressions and might compare long-term wear before deciding.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eExceptional plush cushioning that remains responsive thanks to nitrogen-infused DNA LOFT v3 foam.\u003c\/li\u003e\n\u003cli\u003eReliable GuideRails support that reduces excess motion without feeling restrictive.\u003c\/li\u003e\n\u003cli\u003eComfortable, adaptive fit from the warp knit upper and internal stretch bootie that suits wider feet.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003eSome customers report mixed durability, so heavy-mileage runners should monitor long-term wear.\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eGlycerin GTS 21\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport system\u003c\/td\u003e\n\u003ctd\u003eGuideRails holistic support\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCushioning\u003c\/td\u003e\n\u003ctd\u003eNitrogen-infused DNA LOFT v3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUpper\u003c\/td\u003e\n\u003ctd\u003eWarp knit with internal stretch bootie\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest use\u003c\/td\u003e\n\u003ctd\u003eRoad running, cross training, gym\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePredecessor\u003c\/td\u003e\n\u003ctd\u003eGlycerin GTS 20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCertifications\u003c\/td\u003e\n\u003ctd\u003eAPMA Seal of Acceptance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Brooks Glycerin GTS 21 is a strong choice for runners who want plush, protective cushioning combined with structured support for natural motion control. It offers great day-to-day comfort and helps with foot and knee comfort for many users, making it good value for anyone prioritizing soft, stable rides over lightweight race performance.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eAre these shoes good for wider feet?\u003c\/strong\u003e\u003cbr\u003eYes; the warp knit upper and internal stretch bootie create a more accommodating fit that works well for wider feet.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo they provide real stability for overpronation?\u003c\/strong\u003e\u003cbr\u003eThe GuideRails holistic support system helps limit excess motion and offers meaningful support without feeling restrictive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the cushioning compared with previous models?\u003c\/strong\u003e\u003cbr\u003eThe Glycerin GTS 21 uses nitrogen-infused DNA LOFT v3 for a noticeably plusher, responsive feel compared with prior versions.\u003c\/p\u003e","brand":"Brooks","offers":[{"title":"Default Title","offer_id":48617476948187,"sku":"B0CW773TMW","price":160.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81UvvIo5BtL._AC_SL1500_5de24792-23b2-44af-b7d2-f6a440520a40.jpg?v=1778439171","url":"https:\/\/gearmusthave.com\/products\/brooks-glycerin-gts-21-supportive-running-shoe-plush-support-road","provider":"GearMustHave","version":"1.0","type":"link"}