A fibre designed by US start-up company Optimer Inc that absorbs more perspiration and breathes better will go into production at Fuji Spinning Co this autumn. The 85 per cent polyester Dri-Release fibre, which is made from 'Microblend' threads invented by a former researcher at EI du Pont de Nemours & Co, is said to take just 30 minutes to dry after washing - about four times faster than cotton.