Model Number: KR-B-5K; Size: One size fits all; A/Approx. 8.7 inches (22 cm); B/Approx. 7.1 inches (18 cm); C/Approx. 8.7 inches (22 cm); Material: No. 10 canvas / front key included; Applications: Painting, construction, simple welding work, etc. Prevents foreign objects from entering the ankle; Button type makes it easy to put on and take off, with a front key hook can be fixed