Engel Baby Long Sleeve Onesie in 70% natural organic merino wool and 30% silk is soft, silky and gently warm. Wool/silk is a good blend for sensitive skin. Silk actively balances temperature, giving warmth when it is cold and cools down when warm. Silk can absorb up 40 % of its own weight as moisture. This lovely soft lilac stripe or blue mint stripe onesie has a long waisted yoga pant to match. Wash by hand or machine washable on gentle cycle in warm water.