The Shape is longer on the sides and shorter in the arch to distribute buoyancy evenly. Patented contoured design tones the abdominal muscles and supports and strengthens the lower back. Resilient closed cell foam won’t absorb water, dries quickly, and resists chlorine damage. Custom-woven adjustable 48″ elastic belt. Longer lengths available. Made in USA — Soft, durable, and comfortable Foam dimensions: 29 3/4 long 8″ wide 1 3/8 thick