The slippers are very comfortable and I love the arch support. this particular model, the tongue is attached to the lower half of the shoe with what appears to be some fabric or weak lacing. This is more of an entry level system, but still professional quality for a great price. I am on my third pair of Mayari Birkenstocks. Shredded foam, My Pillow, Purple Pillow (love their beds, the pillow? not so much! This is a quality charger, and I dont have any complaints. Its free. I ordered 3 packs and will be ordering more being that I have 50+ more to store. Havent used since. It had style.