"Kurgo Step-n-Strobe Shoes for dogs are perfect for every terrain! These lightweight dog shoes are essential for those long hikes and adventures on the running trail. These shoes also can protect your four-legged friend's paws from hot gravel in the summer, and severe cold in the winter. Kurgo's dog boots are made of a breathable, tight-weave mesh that works in conjunction with structured synthetic leather uppers and outsoles to provide durability and protection. Soles of shoe also have LED lights, so they light up for visibility at night. To determine size, measure the widest part of the paw against the floor, while your dog is standing up. For 2"" maximum width, choose XX-Small. For 2.25"" choose X-Small. For 2.5"" choose Small. For 2.75"" choose Medium. For 3"" choose Large. For 3.25"" choose X-Large."