Stylish, comfortable and supportive. These athletic sneakers check all of the boxes. The Brooks Glycerin GTS 21 men's running shoe has a breathable warp knit upper and GuideRails technology for support. It features DNA LOFT v3 cushioning, a 10mm midsole drop, and is designed for road and track use. The GTS 21 offers a flexible, accommodating fit, smooth ride and whole-body support.