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.
The base layers include finishes from technical fabric specialist, Rudolf, incorporating:
- HYDROCOOL®: Advanced moisture management draws perspiration away from the body for rapid drying and optimal comfort.
- SILVERPLUS®: Long-lasting antibacterial protection prevents odour-causing bacteria, reducing the need for frequent washing and extending garment longevity.
Strategically placed die-cut ventilation zones under the arms and between the shoulder blades enhance airflow and moisture control, ensuring a fresh, comfortable feel even during intense activity.
The Men’s Dual Active Base Layer Long Sleeved Top offers a tailored, slim fit with curved bonded seams at the sleeves and a polished finish at the neck, cuffs, and hem. Subtle mountain print panels and understated Knox branding add a signature, sophisticated aesthetic.
Available in Black and Light Grey, the Dual Active Base Layer combines technical excellence with refined luxury, providing unparalleled comfort, performance, and style – ready for every season, multiple sports, and every ride.
- Year-round functionality: Essential first layer for performance and comfort in all conditions.
- Fine, breathable polyester and spandex: Luxuriously soft, with excellent stretch and mobility.
- Premium finishes from Rudolf: HYDROCOOL® for moisture management and SILVERPLUS® for long-lasting odour protection.
- HYDROCOOL® swiftly moves sweat from the skin, ensuring comfort.
- HYDROCOOL® plays a crucial role in ensuring comfort by speeding up the drying process of a sweat-soaked base layer on the body.
- HYDROCOOL® efficiently wicks sweat, regulating body temperature and providing a refreshing feeling, elevating comfort and performance.
- SILVERPLUS® prevents the growth of odour-causing bacteria, keeping the base layer fresher for longer.
- SILVERPLUS® reduces washing frequency, which prolongs the life of the base layer.
- SILVERPLUS® has ecological benefits with a lower washing temperature, saving water, energy, and detergent.
- Advanced construction: Bonded seams minimise bulk and pressure points for a flawless fit.
- Strategic ventilation: Die-cut zones under the arms and between the shoulder blades optimise airflow.
- Worn under armour and multi-sport ready: Designed to wear beneath a Knox armoured shirt, reducing stickiness in heat, but suitable for other active sports.
- Refined fit and style: Slim, tailored silhouette with curved bonded seams, subtle mountain print panels, and elegant Knox branding.
- Matching Trousers available
Chest: Measure around the fullest part of your chest and your shoulder blades.
Waist: To work out your size, measure your waist in the position your trousers usually sit. As a guide this is roughly 5-6cm below your belly button.
Please note: The measurements given are body measures and we recommend you do not measure over clothing.
| Men's UK Size |
Chest (Inches) |
Chest (cm) |
Waist (inches) |
Waist (cm) |
| S |
35-37 |
90-96 |
30 |
76 |
| M |
38-40 |
98-103 |
32 |
81 |
| L |
41-43 |
104-109 |
34 |
87 |
| XL |
44-46 |
110-115 |
36 |
92 |
| 2XL |
46-48 |
116-121 |
38 |
97 |
| 3XL |
48-50 |
122-127 |
40 |
102 |
| 4XL |
50-52 |
128-134 |
42 |
107 |
| 5XL |
52-54 |
135-141 |
44 |
112 |
