The Glycerin 21 features:

The Brooks Glycerin 21 provides you with miles and miles of softness and comfort. This plush shoe is optimized for your comfort by being lightweight, responsive, durable and cushioned. Whether you are on your feet all day for work, enjoying a daily walk or training for a marathon, the Brooks Glycerin 21 transforms your experience, making the pavement feel softer and smoother as you put in the work.