The SWADDLE UP TRANSITION BAG 1.0 TOG is the easiest & gentlest way to help your baby graduate from swaddling. It enables you to zip off one wing at a time, allowing your baby to slowly adjust to 'arms-free' sleep. A genius solution that will help you preserve your peaceful sleep routine. The SWADDLE UP TRANSITION BAG ORIGINAL 1.0 TOG is made from a single layer of specially knitted, high-quality, breathable cotton. The 1.0 TOG fabric is ideal for moderate temperatures.