Sammy + Nat Safari Love Sleepsack 12-18 months This 100% Pima Cotton Sleep Sack is all natural, hypoallergenic and gets softer with every wash. Sammy + Nat believes that only the best should touch their skin. Whether it’s your own child, or you’re looking for the best baby gift, you’re in the right place. Zipper front closure 100% Peruvian Pima Cotton.