Anyone ever try these?

(from cyclingnews.com)

Toasty tootsies
Readers still in parts of the world gripped by the depth of winter, could maybe do worse than take a look at these devices from German company Mematec: heated insoles for cycling shoes.

The battery unit on the Mematec Bikeset sits on your ankle and a carbon fiber-reinforced cable powers a heating element in the sole. There are three versions - XL, XXL and XXL special - with run times of 5, 7 and 14 hours respectively. The XXL special model uses the same 4000mAh NiCad batteries as the XXL but switches itself off half the time, a feature Mematec calls 'intermittent heating'.

The heating unit has three settings - 32°, 36°, and 38°C to provide customised warmth for the conditions.

More info: www.mematec.com