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Brooks Adrenaline GTS 21 Review: Find Your Perfect Running Companion

CEO Tinh Phung
Image source: Brooks For the past two years, the Brooks Adrenaline GTS 21 has been flying off the shelves, cementing its position as one of Brooks' best-selling shoes. As a running shoe company with over...

Brooks Adrenaline GTS 21 Image source: Brooks

For the past two years, the Brooks Adrenaline GTS 21 has been flying off the shelves, cementing its position as one of Brooks' best-selling shoes. As a running shoe company with over two decades of experience, Brooks has perfected the art of producing durable, everyday trainers with innovative technology and specialized cushioning.

Brooks Adrenaline GTS 21: Features and First Impressions

The Outsole

Upon unboxing the Adrenaline GTS 21, its durability is immediately evident. The thick rubber outsole provides excellent protection against wear and tear. Additionally, the strategically placed 'omega flex grooves' enhance flexibility and grip, allowing for a smooth and secure ride.

The Upper

The Adrenaline 21 features a double-layered, engineered mesh upper. Its unique structure ensures a secure fit while maintaining breathability and flexibility. The slightly elasticated laces and gusseted tongue further enhance comfort and adaptability.


With a stack height of 30mm, the Adrenaline 21 falls into the maximal running shoe category. It utilizes Brooks' popular DNA Loft cushioning, which offers a firmer foam compared to other brands. The shoe's 12mm drop provides a stable and comfortable running experience.


What sets the Adrenaline 21 apart is Brooks' GuideRails Support System. This technology provides stability and support for those with a tendency to overpronate and heel strikers. The two guide rails, located on the inside and outside of the shoe, work together to keep the foot aligned during the natural running motion.

Colors and Width Options

The Adrenaline GTS 21 is available in a wide range of colors and four width options (Narrow, Normal, Wide, and X-Wide), allowing you to find the perfect fit and style for your runs.

The Road Test: Snug Fit and Firm Underfoot

Brooks Adrenaline GTS 21

From the moment I tried on the Adrenaline 21, I noticed its snug fit and firm underfoot sensation. The shoe hugged my foot securely, providing moderate arch support and a comfortable padded heel counter. The gusseted tongue and flexible laces allowed for a smooth and unrestricted transition during movement.

However, there was initial tightness on the lateral side towards the toe box, which resulted in some discomfort. This issue can be attributed to the shoe's break-in period and limited breathability. Nonetheless, with time and wear, these discomforts gradually dissipated, and the shoe became more comfortable.

In terms of landing, the Adrenaline GTS 21 offers a firm yet responsive feel. The DNA Loft foam, designed to soften over time in areas of repeated impact, provides a cushioned and stable ride. The shoe's stability support system, combined with its extended cushioning, ensures a smooth transition and minimizes the risk of injuries.

Who Should Consider the Brooks Adrenaline GTS 21?

Brooks Adrenaline GTS 21

In summary, the Brooks Adrenaline GTS 21 is an excellent choice for those seeking a versatile daily running shoe. Its flexibility, snug fit, stability, and durability make it ideal for easy miles, long distances, and a variety of terrains. However, if you prioritize speed runs or immediate comfort, this shoe may not be the best fit for you.

The Adrenaline GTS 21 requires a break-in period to overcome initial rigidity and tightness. It is crafted with resistant and durable materials to ensure longevity and countless miles of running. Brooks stands behind their product with the RunHappy Promise, allowing you to try the shoes for 90 days before making a final decision.

If you're still unsure about the Brooks Adrenaline GTS 21, consider trying the Saucony Endorphin Shift 2, another fantastic high-mileage trainer. Check out our review of this star shoe here.

Choose the running shoe that suits your needs and preferences. Find the perfect companion for your running journey with the Brooks Adrenaline GTS 21.