The Aussie Foot Warmers are 100% lambswool (no rubber sole).  Lambswool is made from natural fibre, and although not as thick as sheepskin, it is more versatile and just as cosy and warm.  The Aussie Foot Warmer is like a slipper, perfect to wear around the house, but also to bed.  The design includes a stretch material top for a comfy fit.  Come wintertime, The Aussie Foot Warmers are a must-have, and one of our most popular products, but they are great all year round.