Speed Chutes will add serious intensity to any training regimen with increased speed, explosiveness, and acceleration. Chute opens during running and the quick-release Velcro belt allows for mid-stride release. Built-in mesh panels keep strings from tangling and help to stabilize the chute during training runs. Speed Chutes include: quick-release adjustable belt, chute and custom carrying bag. Sizes: Small - 40", Medium - 48", Large - 56", X-Large - 64". Wt. 1 lb. each. Sizing recommendations: varies based on athlete size and training level.