Water Gear Aqua Trim Flotation Belt. Maximum Waist Size: SM (38"), MED (48"), LG (67"). Fully adjustable nylon belt holds securely and comfortably at the waist. Provides lumbar support and vertical balance in the water, great for water aerobics. Designed to allow maximum range of motion and ease of breath. Soft, comfortable closed-cell EVA foam won't chip, break or absorb water.