The LERNA style riser from WADSN is an aluminum accessory designed for T1/T2 red dots (like RD-1 and RD-2). With a height of 2.91 inches, it raises the optic for faster target acquisition and a more ergonomic posture, especially when using headsets, night vision devices, or gas masks. Compatible with standard 20mm rails (Picatinny).
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!
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The LERNA style riser from WADSN, inspired by the design of the GBRS Group (like the Hydra riser), is an aluminum optic mount designed to improve ergonomics and target acquisition speed. Compatible with T1/T2 style red dots (like the RD-1 and RD-2 models), this riser offers a high optical center line of 2.91 inches (approximately 7.4 cm).
This increased height facilitates target identification, even in the presence of obstructions due to equipment, such as headsets, Bowman, gas masks, or night vision devices. A higher optic position allows you to maintain a more upright posture with your head up ("Heads-up"), reducing neck and back fatigue and improving situational awareness.
The LERNA riser mounts on standard 20mm rails (Picatinny) and is made of aluminum, which guarantees lightness and robustness.
Technical Specifications:
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