Childrens/Kids Bart Simpson, The Simpsons Snuggle Sac, Indoor Sleeping Bag (24 x 60 Inches) (Blue) Quality Snuggle Sac 100% polyester. Use a snuggle sac instead of a lightweight duvet or blankets and sheets for sleeping all night at home, on holiday, for snoozing on the sofa or even for sleepovers. Machine washable. Please note: this product is not warm enough to be used for camping and is only suitable for indoor use.