null Best leggings ever! Warmest leggings I’ve ever had. Can wear them in the house without anything else if you are working. Thermal underwear uses premium close-fitting fabrics to keep you warm by trapping air close to your skin, so heat loss from your body is minimised. At the same time, they draw sweat away from your skin, doubling their warming effect. When worn under regular clothes, thermal underwear becomes an effective base layer that can keep your body warm and comfortable, whatever the weather. Do you wear normal underwear underneath thermal underwear? The money-saving premise is simple. She followed Martin Lewis' MSE's suggestion to "heat the human, not the home", in the hope she'd feel warm enough she'd not need to turn her heating on. To do so, she selected a range of products from M&S' thermal line, including clothing with Heatgen™ technology.

In fact I need to buy another pair because I literally don't want to take them off now they're just so flipping warm and comfy." They are all really easy to wash in a standard washing machine, and as they're created with stretch they are also particularly comfortable and practicable items to have at hand.Daydream0146 More colours please Couldn’t be without these vests in the winter. They are super warm.

It was so snazzy you could actually wear this as a going out top - and was a refreshing change from the old stereotypes of thermals as holy cream vests and long johns. westendgirl507 Heatgen (trade mark) Thermals for women I have had no great misgivings about thermal undergarments previously bought at M& S but Heatgen is revolutionary in the best sense. Light as a feather and breathable. Perfectly designed as the essential first line of defence under Autumn/ Winter clothing. Well done to M &:S for ensuring (last time I looked online) that all sizes remain available. The main problem I found was the part left uncovered by the thermal wear - eg my hands - which started to get cold as I typed away while the rest of me was staying pretty warm in the layers. But overall, the thermal layers, underneath a fleecy jumper, did keep me really nice and warm."

How tight should thermal underwear be?

JG17 Warm and comfortable Very comfortable and a generous length. Lovely and warm for yoga classes. Both were smart enough for workwear when worn on their own, or as decent base layers for when you need to wear extra layers.

The main problem I found was the part left uncovered by the thermal wear - eg my hands - which started to get cold as I typed away while the rest of me was staying pretty warm in the layers. Dianne Bourne, of The Manchester Evening News decided to put the thermal range to the test, here is how she got on. Having said this, I really feel the cold, more than an average person, so I always wear these thermals under my clothes. These may be warm enough for other customers. It was so snazzy you could actually wear this as a going out top - and was a refreshing change from the old stereotypes of thermals as holy cream vests and long johns," wrote Dianne.

She wrote: "Overall, I was pretty impressed with the M&S range - particularly the Heatgen items with their super cosy fleecy interior. All of the items I felt offered a reasonably-priced way to try and keep yourself warm this winter.

As I tend to feel the cold in my old house, I wasn't convinced that even with the thermals' toasty warm qualities they'd help me resist hitting the heating button though. But the biggest hit for me was the Thermal Heatgen™ Plus leggings. These were like a normal comfy legging, but with a soft brushed inside which kept me super warm and cosy throughout the day. hairlady Heatgen Thermal Leggin Nice soft leggins. Good fit. Feel warm when wearing despite fabric seeming thin.haz1234 Very warm and comfortable I love this product. It's very warm and comfortable and I'm planning to get another one Dianne concluded that the range could be improved with the addition of a "thumb hole" in the tops but she was nonetheless happy with her investment.