Brooks Glycerin 21

The upper of the Brooks Glycerin 21 features a warp-knit design that provides a snug and comfortable fit. This material is known for its flexibility and breathability, although some runners find it less ventilated than traditional mesh. The knit upper stretches to accommodate different foot shapes, offering a secure fit without causing hot spots or discomfort. However, the thicker knit can make the shoe feel warm, especially in hot weather, which may not be ideal for those running in warmer climates.

The midsole of the Brooks Glycerin 21 is constructed with DNA Loft v3 foam, a nitrogen-infused material that offers a plush and cushioned ride. This foam is designed to be lightweight and durable, providing excellent shock absorption for long-distance runs. The midsole's softness makes it ideal for easy-paced runs, but it may lack the responsiveness needed for faster workouts. The 10 mm heel-to-toe drop supports a smooth transition from heel to toe, catering to heel strikers.

The Brooks Glycerin 21 features a RoadTack outsole, known for its durability and grip on road surfaces. The outsole is segmented, allowing for flexibility and a smoother ride. While the rubber lugs provide adequate traction, they are not overly aggressive, making them suitable for road running but less effective on trails. The outsole's design contributes to the shoe's overall stability, although some runners have noted that it may wear down faster than previous models.

The Brooks Glycerin 21 offers a true-to-size fit with a medium toe box that accommodates most foot shapes. The shoe is available in both standard and wide widths, ensuring a comfortable fit for a variety of runners. The warp-knit upper provides a snug fit, while the padded tongue and heel collar enhance comfort. Some runners have noted that the shoe feels slightly shorter than average, so trying on a pair before purchasing is recommended.

Comfort is a standout feature of the Brooks Glycerin 21, thanks to its plush DNA Loft v3 midsole and cushioned interior. The shoe provides a soft and supportive ride, ideal for long-distance runs and recovery days. The padded tongue and heel collar add to the overall comfort, while the warp-knit upper offers a snug fit without causing irritation. However, the shoe's warmth may be a drawback for those running in hot climates.

The Brooks Glycerin 21 is designed with maximum cushioning in mind, featuring a DNA Loft v3 midsole that provides a soft and plush ride. This cushioning is ideal for long-distance runs, offering excellent shock absorption and comfort. The shoe's 10 mm heel-to-toe drop supports a smooth transition, making it suitable for heel strikers. While the cushioning is luxurious, some runners may find it lacks the responsiveness needed for faster-paced runs.

The breathability of the Brooks Glycerin 21 is somewhat limited due to its warp-knit upper. While the material offers a snug and comfortable fit, it may not provide the ventilation needed for hot weather running. Runners in warmer climates may find the shoe feels warm, which could lead to discomfort during long runs. However, the knit upper does offer some flexibility and stretch, accommodating different foot shapes.

The Brooks Glycerin 21 offers a stable ride, thanks to its wide base and supportive midsole. The shoe's DNA Loft v3 foam provides a cushioned platform that absorbs shock and reduces impact, making it suitable for long-distance runs. While the shoe is not specifically designed as a stability shoe, its lateral side rails and firm heel counter offer additional support for neutral runners. The shoe's stability is enhanced by its segmented outsole, which allows for smooth transitions.

Durability is a strong point for the Brooks Glycerin 21, with its RoadTack outsole providing long-lasting grip and wear resistance. The DNA Loft v3 midsole is designed to maintain its cushioning properties over time, ensuring a consistent ride. However, some runners have noted that the outsole may wear down faster than previous models, particularly in the forefoot area. Despite this, the shoe's overall construction is robust, making it a reliable choice for high-mileage runners.

The grip of the Brooks Glycerin 21 is provided by its RoadTack outsole, which offers reliable traction on road surfaces. The rubber lugs are designed to provide a secure grip, although they are not overly aggressive, making them less suitable for off-road conditions. The outsole's segmented design allows for flexibility and smooth transitions, enhancing the shoe's overall performance on paved surfaces. While the grip is adequate for road running, it may not be sufficient for more technical terrain.

The Brooks Glycerin 21 offers moderate flexibility, thanks to its segmented outsole and warp-knit upper. The shoe's design allows for smooth transitions and a natural running feel, although it may not be as flexible as some other models in its category. The DNA Loft v3 midsole provides a cushioned ride, but its plushness can limit the shoe's overall flexibility. Runners seeking a more flexible shoe may find the Glycerin 21 slightly stiff, particularly in the forefoot area.

Yes, the Brooks Glycerin 21 is an excellent choice for marathon training due to its plush cushioning and supportive design. The DNA Loft v3 midsole provides a comfortable ride, making it ideal for long-distance runs.

The Brooks Glycerin 21 offers a true-to-size fit with a medium toe box. It is available in both standard and wide widths, accommodating various foot shapes. Some runners find it slightly shorter than average, so trying on a pair is recommended.

The Brooks Glycerin 21 has a heel-to-toe drop of 10 mm, which supports a smooth transition from heel to toe, making it suitable for heel strikers.

The Brooks Glycerin 21 features a warp-knit upper that provides a snug fit but may not offer the best ventilation. Runners in hot climates might find the shoe warm during long runs.

While the Brooks Glycerin 21 is designed for comfort and cushioning, it may not be the best choice for speedwork due to its plush midsole and heavier weight. Runners seeking a more responsive shoe for fast-paced runs might consider other options.