1. Internal breathable mesh, comfortable and not stuffy2. Easy to wear, not tight3. The bust can be adjusted appropriately, easy to use4. Thick nylon webbing grip, firm and not easy to break5. Material: cotton fiber+EVA+mesh cloth6. Size: XS/S/M/L/XL7. Weight: XS is about 120 grams, S is about 150 grams, M is about 180 grams, L is about 200 grams, and XL is about 220 grams

http://olla.gr/k9-dog-adjustable-chest-strap-size-l-breathable-white/