M = 21.65""L x 10.24""W (22-55 pounds), Large = 10.24""L x 9.45""W (33-66 Lbs). Durable buoyancy pad: Thickened polyester fabric, double-stitched for reinforcement, uses anti-fading technology, increasing durability by 5 times. Comfortable to wear: Made of 50% polyester and 50% Epe, lightweight and quick-drying. Safety buckle: Requires pressing 3 buttons simultaneously to open. Good buoyancy ensures the head is always above water. Weight: 0.33 lbs (approximately 150 grams).