Marks & Spencer's £12.50 clothing items hailed as so warm they 'help save money on heating bills'

Marks & Spencer shoppers are raving about the brand's thermals with Heatgen technology that are apparently so warm they can help "save on heating" in the winter. The brand's exclusive Heatgen fabric is designed to retain heat and feel soft against skin, with many shoppers saying it feels like a "second skin", while the Heatgen Plus variety is brushed on the inside for "optimum insulation".

The Heatgen range includes long sleeve tops (two for £25), vests (£12.50 and £18.00 for mens vests Click here to see more info), leggings (two for £25) Click here to find out more and more. Reviewers claim the Marks & Spencer Heatgen thermals, which are in demand on the website right now, are a "must have" for the winter with some admitting they buy multiple every year.

Most of the products are available in numerous colour options from basic creams and blacks to more festive sparkly and red. Giving the Heatgen long sleeve top two-pack five stars, one reviewer wrote: "Lovely warm t shirt, great to wear under a shirt, A must have during these cold times and expensive heating costs!"