WOMEN'S GLYCERIN GTS 21 Size:5.5 increasing your ability to flex

increasing your ability to flex and move from side to side

In the process

So we made the Cloudswift tougher

Elastic waistband and key pocket

WOMEN'S GLYCERIN GTS 21 Size:5.5 increasing your ability to flexThe Brooks Glycerin GTS 21 is a stability version of the Glycerin 21, designed to provide the plush cushioning of the Glycerin series with the added support of Brooks' GuideRails system. This makes it an excellent option for runners who need extra stability but dont want to sacrifice comfort. Here's a detailed review: Comfort and Cushioning: The Glycerin GTS 21 offers exceptional comfort, thanks to the DNA LOFT cushioning that extends throughout the