Woolino 4 Season® Ultimate Toddler Sleep Bag Navy Blue size 2-4 years Brand New in box. Retail $129.00 Ok 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.