Super soft, sleek, and supportive, the Men's Brooks Glycerin StealthFit GTS 21 Running Shoes push your performance and comfort to the limits while providing whole-body support. Groundbreaking GuardRails technology gets added to the Glycerin StealthFit series for total support, limiting excess motion for streamlined efficiency, so you get the most out of your stride, mile after mile. Men's Brooks Glycerin StealthFit GTS 21 Running Shoes