Made of Neoprene-the material used fordiving & surfing suits..gniyrdysaedna,tfos,gnihtaerb,citsalEM a i n t a i n s t h e b a b y ' stemperature in the water.Comfort: Light and easily stored andcarried in all types of travelling bags.Lined shoulder belts and easy toc o n t r o l s a f e t y b u c k l e s .Just adjust it once andw e a r i t a s a T - S h i r t !