For when it is cold.... The HKM Heating Vest has adjustable temperature from the outside with - with its integrated heating function. Just pop the button and the built in heater will come on.
It is lightweight and comfortable to wear with lightly wadded lining and it has a 2-way zip for riding. Elasticated side inserts and two outside pockets with zipper. Can be worn as an underlayer or on its own with tight fit for a better heat retention.

Battery supplied.

More info:

Adjustable temperature
Machine wash at 30 degrees on delicate
100% polyester (filling and outer fabric)
2-way zip
Elasticated side inserts
Integrated heating function
Two outside pockets with zips
Excellent heat retention
Powerbank included
Run time of 4 hours per charge