Our soft muslin sacks are ideal for warmer weather, summertime, or warm climates. The voile fabric is light and breathable. The sleeveless design made with 3 layers of voile. Sleeping sacks are a perfect way to keep babies covered when they are fully transitioned from the swaddle. TOG rating of 0.3 Handy 2-way zipper zips down from the top making it easy to place baby into sack and also zips up from the bottom making diaper changes easy.