They do not feature any additional fabric on the inside to keep feet cooler, breathable and feel more lightweight. They’re strategically designed with stretchable slingbacks for a relaxed but secure fit. They allow the feet to move, breathe, and grow without being constricting. Moreover, they provide enough air while adding some warmth without overheating to ensure slippers always stay fresh. They can be put in the washing machine. High quality certified cotton holds up very well even after numerous washes. It will endure multiple launderings and will be still offering softness and warmth. Have a soft sole with an anti-grip layer to help with stability and prevent slipping so that kids feel comfortable when they are running around or after a relaxing bath time. They’re made for daily worn for longer periods of time. Cuteness is a major factor in kids’ slippers.