Hang Loose Hawaiian Cooling TopThese innovative island fashions are straight from Hawaii. They not only look great, they keep your little one as "cool as a cucumber." They have crystals throughout that, when soaked, turn into a gel. This holds the water at a cool temperature of 65º for three to seven days! Velcro at neck and tummy for a perfect tropical tank-top fit. Hand wash, air dry. Do not freeze please, refrigerator okay. Go one step further and pair the vest with the cooling mat. Even better, get a FREE toy when you order the Keep it Cool Small Mat COMBO or Large Mat COMBO. Cooling top girths: 8-11", 12-15", 16-19" and 20-23"