Classic Australian Ugg Boot design Easy to wear, has elastic fastener with button buckle to adjust width Updated footbed, even more comfy Signature arch support structure. Internal EVA arch support orthotic (built-in) Warm inner lining. TC Polyster lining – anti bacterial, anti-odour, wicks away moisture, non-irritative Soft plush external upper. Super Lightweight & Comfortable Machine Washable and Dryable. The Archline Orthotic Ugg Boot Slippers Slippers are the World’s Most Comfortable Ugg Boot Slippers. They have a Classic Australian Ugg Boot design They are Super Lightweight, Warm, Comfortable and Slip Resistant. The signature ARCHLINE Orthotic Base is built in to the slipper and is perfect for foot pain, heel pain, arch pain, plantar fasciitis, overpronation and many more foot conditions. Podiatry Recommended. Machine Washable and Dryable.