The Ugg Ultra Short Boots are designed for durability,comfort,and years of wear.Made with top-of-the-line twin-faced sheepskin with suede toe and heel guards.The sheepskin breathes extremely well and the air spaces formed next to your leg by the looseness of the wool means that your lower leg and foot will be comfortable in the boot even in warm weather.TheUgg Ultra Short boot features a removable and replaceable comfortable system insole is made of sheepskin,latex and foam for "ultra" comfort with a Mylar sockliner for warmth.And molded rubber lug cup sole for strength and durability on rugged surfaces.