The 400 thread count organic cotton outer has a silky smooth feel and is made from easy-care woven cotton fabric, similar to the feel of a flat sheet on your own bed. The stretchy side and shoulder panels are made from organic jersey cotton and ergonomically designed to allow your little one to move freely and prevent getting tangled during sleep.In Sleep Suit mode (with legs), this is the perfect sleep solution for little wrigglers and movers who like more leg freedom in sleep, and toddlers/pre-schoolers transitioning from cot to bed. Whilst in suit mode, the product can also be used with a 5-point harness such as in a pram for day sleeps on walks*. In Sleep Suit mode, the product provides comfort by not restricting the legs during sleep and reduces the risk of cot climbing injury. Grip pads on the feet keep your little one stable if walking overnight to the bathroom (or into your room!). The four-way zippers provide ease of use for overnight toilet training. In either Bag or Suit mode, the product is hip-friendly for growing hip joints.The TOG rating means that there is no need for additional blankets in the cot when using this product, making it a safe-sleep option. Parents can be assured the breathable GOTS certified Organic Cotton will help your child maintain an even temperature whilst sleeping, and prevent overheating. The stretchy organic jersey sleeves are a soft fleecy material and rated 1.0 TOG to provide extra warmth on chilly nights. The sleeves feature fold-over cuffs and mitts for keeping fingers and hands warm too. Parents can follow the FREE room thermometer and What to Wear guide provided with the product, to layer appropriately underneath to keep their child warm.