Sheer yet snug and providing added winter warmth when layered comfortably underneath a shirt and sweater or cardigan, the uniquely developed HeatTech fabric includes a rayon mix that actually absorbs the moisture generated by the body and converts it into heat.

And now you can experience the benefits of HeatTech yourself - for free! Simply visit our London Flagship store at 311 Oxford Street between Monday 10 and Saturday 22 November where we've created a giant HeatTech photo kiosk. You can have your image taken with a special thermal camera; identifying where your cold spots are and why you need HeatTech! We'll then email you the image so you can show your friends too.

And if that's not enough to help you beat the winter chill, we're giving away free Heat Tech gift packs* at our London Flagship store at 311 Oxford Street on Thursday 20 November from 10am, each worth nearly £20! There are 4,000 gift packs to give away and all you need to do is look out for the HeatTech team - you won't miss them, they'll be dressed in silver jumpsuit's toting thermal imaging cameras, anyone they think is cold enough will receive one of these HeatTech gift packs!

View the women's HeatTech collection, priced from £7.99

View the men's HeatTech collection, priced from £7.99

Terms & Conditions Apply: Gift only available whilst stocks last. One gift per person. Gift is non-refundable and non-transferable. No cash will be offered as an alternative.