The Hi & Light Collar is an ultralight and ultra-strong dog collar with a minimalist design. Built with webbing inspired by rock climbing slings and runners known for their impressive strength-to-weight ratio, the Hi & Light Collar keeps it simple with Ruffwear s signature collar features: an aluminum D-ring, a piton-inspired separate ID tag attachment point, and a silicone tag silencer. Size Guide: S: 23-28cm M: 28-36cm L: 36-51cm XL: 51-66cm.