The Life Jacket has a adjustable chin strap that can be adjust to the wearers neck size. The adjustable chinstrap holds the head in the optimum position for maximum in water performance (even if the wearer becomesunconscious) and optimizes the survival time.The Besto SOLAS EC infant size Life Jacket is designed to fit persons weighting from 0 to 15 kg and with alenght up to 100 cm.Extra features infant- double crotch closing- grabloop on collar