The Sweatz Training Vest has been made available to retailers and health clubs for the first time.

A patented, 100 per cent toxin free, biodegradable vest that is worn beneath training clothing, it works by causing the body to sweat more, which uses up more calories in order to help generate what is claimed to be dynamic weight loss.

The water lost is replaced by drinking, however the calories used to create the sweat are said to stay off. In addition, the sweating also helps the body detoxify, eliminating chemicals stored in the fat cells, theoretically making weight loss easier.

Designed by former top 10 UK sprinter Chris Hamilton, the vest differs from plastic bags and the like by not delivering toxins to the skin (contained in the bags) while not damaging the environment.

Effective for a range of sporting activities, the vest is then thrown away after use and comes endorsed by Amy Thomason, British Karate champion.