I dressed head to toe in Marks and Spencer thermals to see if they

#xa; If you aim to "heat the human, not the home" you might want to give a load of thermals a try like our writer did

TESTING MARKS AND SPENCER THERMALS

Marks and Spencer Women's Heatgen Thermal Built Up Shoulder Cami

23 Best Sports Brands For Workout Clothes For Women

Made with Heatgen Plus™ thermal technology, these lightweight leggings are great for staying warm on chilly days. Added stretch for a comfortable fit.

Heatgen™ Medium Fleece Thermal Leggings

The Best Women's Thermals for Winter

Heatgen™ Medium Thermal Brushed Leggings, M&S Collection

3pk Heatgen™ Light Thermal Socks

Yorkshire Post Glam In Gloom Harrogate Mama – Harrogate, 44% OFF

I tested the popular M&S thermals and didn't need to turn on

The warmest loungewear to keep you cosy in the colder months

Heatgen™ Medium Thermal Brushed Leggings, M&S Collection