Sevylor Big Basin 3-Person Kayak Heavy-duty PVC construction is rugged for lake use Tarpaulin bottom provides durable protection from punctures Multiple air chambers allow another chamber to stay inflated if one is punctured Airtight System is guaranteed not to leak Boston Valve is double threaded for easy inflation/deflation Adjustable seats move to fit you Spray covers block splashes to help keep you dry Fits three people NMMA certified to hold up to 490lbs. Inflated dimensions: 12 ft. 3 in. x 3 ft. 1 in.