Reposhing because I purchased the wrong item (I meant to order the 2-24 month sleep sack), I have not used this sleep sack. There is a small mark on one of the shoulder straps and a tiny hole on the inside The award-winning 4 Season® Ultimate Toddler Sleep Bag keeps your toddler at a perfect temperature throughout the night, year-round. That means there’s no need to worry about which weight sleeping sack to use, or whether your child will be too hot or cold while sleeping – they’ll always be just right! Made with super-fine and supremely breathable merino wool, it helps keep your toddler warm when it’s cold and cool when it’s warm. That temperature regulation means that your child will sleep comfortably throughout the night– and that means a better night's sleep for you too. Cuddly-soft organic cotton outer adds to the comfort as it's perfect for the most delicate skin. It comes in a universal size that fits kids from 2 to 4 years. It saves you buying a different sleeping bag for different seasons, as well as buying larger ones as they grow. You just need one Woolino sleep bag for your toddler that will fit for 2 years. Premium Natural Fabrics Silky-soft hypoallergenic merino wool lining and the finest organic cotton outer. 4 Season use