Knox Dual Active Men's Base Layer LS top

The Knox Dual Active Base Layer forms the foundation of the Seasonless® Collection, engineered as the first layer worn next to the skin. Designed for year-round performance, it delivers a precision fit, lasting comfort, and advanced moisture control. Intended to be worn beneath a Knox armoured shirt, it prevents stickiness and discomfort in the heat, while its versatile design makes it equally suited to other active sports. Reinvented for 2026, the Dual Active range is crafted from fine, breathable polyester and spandex, delivering a soft, smooth touch while maintaining exceptional stretch and mobility. Bonded seams and reduced stitching create an ultra-flat, streamlined fit, minimising bulk and eliminating pressure points beneath other layers. Care Please read care label for washing instructions. Machine wash cold on a delicate cycle. Use non-bio detergent. Low iron. Do not use fabric conditioner. Do not tumble dry. Dry flat. Size Guide (body measurements) Size Chest (cm) Chest (in) Waist (cm) Waist (in) S 90-96 35-37 76 30 M 98-103 38-40 81 32 L 104-109 41-43 87 34 XL 110-115 44-46 92 36 2XL 116-121 46-48 97 38 3XL 122-127 48-50 102 40 Chest: Measure around the fullest part of your chest and your shoulder blades. Waist: Measure where your trousers usually sit, roughly 5-6cm below your belly button. If you measure in between sizes or at the top end of a size, we recommend going up one size.