The AMBITYON DEFENDER Long Sleeve Base Layer by UYN is the elite thermal base layer designed to tackle the most demanding outdoor activities in low temperatures. Thanks to the revolutionary Hypermotion zero-seam construction in the shoulder area, this shirt ensures optimal postural support and absolute freedom of movement. The 3D knit fabric integrates special Shoulder Pads, specifically designed to cushion weight and absorb vibrations when wearing a tactical backpack. Equipped with advanced Coolvent and Drylight ventilation technologies, it keeps the skin constantly dry, wicking moisture outwards for lasting comfort in the field.
This is an approximate conversion table to help you find your size. If you have already purchased an item from our brand, we recommend you select the same size indicated on its label.
| International | XS | S | M | L | XL | XXL | XXXL |
|---|---|---|---|---|---|---|---|
| Europe | 32 | 34 | 36 | 38 | 40 | 42 | 44 |
| US | 0 | 2 | 4 | 6 | 8 | 10 | 12 |
| Chest Circumference (inches) | 33-35" | 36-38" | 39-41" | 42-44" | 45-47" | 48-50" | 51-53" |
| Chest Circumference (cm) | 84-89 | 91-97 | 98-104 | 107-112 | 114-119 | 122-127 | 129-134 |
| Waist Circumference (inches) | 28" | 30" | 32" | 34" | 36" | 38" | 40" |
| Waist circumference (cm) | 71 | 76 | 81 | 86 | 91.5 | 96.5 | 101.5 |
LOWA FOOTWEAR SIZE CHART
SIZE SELECTION:
THE SIZES IN THE DROP-DOWN MENU ARE UK SIZES (ENGLISH)
conversion chart: UK size - (IT size) - size in mm
Size 6.5 (40) 257mm
Size 7 (40 3/4) 262mm
Size 7.5 (41.5) 266mm
Size 8 (42) 270mm
Size 8.5 (42.5) 274mm
Size 9 (43 1/4) 278mm
Size 9.5 (44) 283mm
Size 10 (44.5) 287mm
Size 10.5 (45) 291mm
Size 11 (46) 295mm
Size 11.5 (46.5) 300mm
Size 12 (47) 304mm
Size 12.5 (48) 308mm
Size 13 (48.5) 312mm
NEED ADVICE ON CHOOSING A SIZE?
Take one of your sneakers and look at the size in mm or cm, look at the diagram above to see what it corresponds to and order your size!
e.g., your sneaker is 27.2 cm long? Great, the closest and most correct size will be: "TG 8.5 (42.5) 274mm", in the purchase menu select size 8.5UK!
By buying this product you can collect up to 10
loyalty points.
Your cart will total 10
points that can be converted into a voucher of
2.00.
Designed for Action and Mobility:
The AMBITYON DEFENDER shirt is designed for those who are always on the move. The patented Hypermotion technology eliminates seams in the shoulder area, supporting posture and allowing fluid, unrestricted weapon transitions. To fully support the operator under heavy load, it integrates Shoulder Pads: a thickened three-dimensional structure that acts as a cushion under the plate carrier or backpack straps, absorbing vibrations and delaying fatigue.
Dynamic Climate Control (Coolvent and Drylight):
When the pace picks up, sweat management is vital. The internal channels of the Coolvent system generate a constant airflow that cools the body during exertion. Simultaneously, the ultra-absorbent Drylight technology, strategically placed in critical areas, wicks moisture away at an incredible speed. The result is a perfect microclimate: you'll never freeze due to a sweaty shirt when the action stops.
Strategic Protection and Insulation:
The most exposed areas of the torso are protected by Iso Chambers, which increase insulating power against wind and atmospheric cold. The elbows, crucial for supported shooting, are protected by Resifit: three-dimensional air chambers that insulate the joint and reduce friction. Finally, the Heatmemory system traps muscle heat during breaks, optimizing recovery and preventing strains or contractions from cooling.
Pro Tips: Ambityon or Fusyon?
The setup for those always on the move: The difference between this line (Ambityon) and the Fusyon line lies entirely in your role on the team. If you're an assaulter, if you do fast patrols, CQB, or if you simply tend to sweat profusely under your plate carrier even in winter, the Ambityon is your definitive choice. This shirt sacrifices a very small percentage of static warmth in favor of extreme drying capability. Conversely, if your role involves long hours stationary in the cold (e.g., Sniper or static defense), opt for the Fusyon model.
Technical Washing: To maintain the incredible wicking properties of the Drylight and Coolvent systems, wash the shirt at a maximum of 30°C. Never use fabric softener! Fabric softener surfactants glue technical fibers together, permanently destroying the shirt's ability to wick away sweat.
The FUSYON DEFENDER Long Sleeve Base Layer produced by UYN is...
