For infants less than 30 pounds, featuring an elasticized leg strap and a unique collar design which provides improved head support.Features: Convenient buckle opening at collar makes it easy to put on Durable nylon outer shell poly-twill inner Lightweight, durable flotation foam Elasticized fabric leg strap for added comfort Oversized collar for added head support Encircling waist belt ensures a secure fit Convenient grab strap for easy recovery Fits infants less than 30 lbs. Type II