Pellor Portable Patrol Tactical Training Nylon Dog Vest Jacket Coat 1000D quality nylon material, durable in use. Neck circumference freely adjustable. Compatible with Molle system, extra pouches or accessories can be placed. Velcro fastener design on top center. S Chest50-68 cm / 19.7-26.8 inch, LChest65-100 cm / 25.6-39.4 inch.