The FitFlop Billow in black available at Athlete's Foot, David Jones and selected retailers

You have to admit this sounds too good to be true. A seriously comfy, warm and cosy slip-on boot shoe perfect for lazy days that takes all the hard work out of toning your legs and bottom, along with relieving lower-back pain, improving co-ordination and balance. However the FitFlop Billow claims to do just this, and frankly we can't wait to try them out.

The original FitFlop summer thong style sandal was created in the UK by famed Bliss spa-entrepreneur Marcia Kilgore and Senior Lecturing Biomechanist Dr David Cook and a team of footwear engineer technologists. The aim? To help today's busy women fit more exercise into their day. How does the FitFlop work? Slighty destabilising, the FitFlop features three different shoe hardnesses of EVA foam, which challenge your muscles each time you take a step. Sounds seriously simple, yet super smart.

The original thong style FitFlops have been available in the UK since 2007, with over one million pairs of FitFlops already snapped up. This year through demand from loyal customers, who want to wear them year round and were getting cold tootsies from refusing to give them up when winter arrived, the snug FitFlop Billow was created. The Billow comes in caramel, black, mushroom, chocolate and pink, and for $199.95 they are certainly cheaper than a gym membership and much easier to fit in to you daily schedule.