Heatgen™ Medium Fleece Thermal Leggings

Made with Heatgen Plus™ thermal technology, these lightweight leggings are great for staying warm on chilly days. Added stretch for a comfortable fit. Made from super-soft fleece that's brushed on the inside for extra warmth in the coldest temperatures.
Heatgen™ Medium Fleece Thermal Leggings

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M&S Collection 2pk Heatgen™ Thermal Light Leggings - ShopStyle

Shoppers excited by 'cosy collection' at M&S which saves you from putting the heating on - Mirror Online