Our clever Heatgen™ technology uses an innovative fibre blend, helping your body to generate and retain heat so you can stay warm when the weather gets chilly. Perfect for a lightweight base layer, this pack of two thermal short sleeve tops come in a regular fit with a crew neck and short sleeves. Flexifit™ fabric made with Lycra® for 360 degree stretch and enhanced comfort. Moisture-wicking properties for all-day freshness. Super soft seams and heat-sealed labels ensure a gentle feel against your skin. Made with responsibly sourced viscose. We only ever use responsibly sourced cotton for our clothes.