Solution to Coffee-Time Challenge

. This is a multi-layered band worn on the wrist, with a waterproof outer surface, a metallised reflective inner core, and an absorbent inner lining. The inner liner traps air and prevents heat loss by conduction and convection and the middle layer prevents heat loss by radiation. As blood passes close to the surface of the skin at the wrist, heat is reflected back, so that the body keeps open the vessels that supply blood to the wrist. Rees had previously designed products for patient thermo regulation and hypothermia prevention for the NHS, MOD and Emergency Services. He came up with the idea for the present product when his grand daughter began to suffer from painfully cold hands. “I was involved with this for a number of years,” he said. “It’s known technology. We have just developed it a bit further.” The bands are thin enough to be worn discreetly, and do not interfere with normal clothing or movement. Users include skiers, golfers, horse riders, outdoor workers – and ordinary people with cold hands.