Developed to capture maximum heat with minimum weight, Sitka's Kelvin line of insulation pieces focus on high heat-to-weight ratios. The warmest pieces are designed to layer under one of the soft or hard shell pieces. All utilize Primaloft's superior synthetic loft material.
PrimaLoft® Performance Down Blends
The ultimate combination of PrimaLoft® ultra-fine fibers and water-repellant down, offering high-performance warmth and comfort in variable conditions while adhering to the PrimaLoft® promise of an environmentally safe technology free of fluorocarbons.
Layering is a science with our CORE system of next-to-skin products. Each of the fabric weights—light, mid, and heavy—wicks away moisture to keep you warm and dry, while Polygiene® technology safely and permanently neutralizes odors using naturally antimicrobial silver salt. Build the foundation of your system with a specialized base layer designed to suit your environmental conditions.
Sweat is odourless but helps create the perfect environment for odour-causing bacteria to multiply. When sweat mixes with odour-causing bacteria on fabrics, odour results.
Polygiene uses naturally occurring silver salt (silver chloride) made from recycled silver, a highly effective antimicrobial agent, to safely inhibit the growth of odour-causing bacteria and fungi. However, Polygiene does not affect the natural bacterial flora of your skin. And without odour-causing bacteria, you stay fresh.
Buy with confidence, we will happily swap sizes for you.
Sitka sizing is comparable to New Zealand and Australian sizes - so if you wear a large in a work shirt a large in Sitka will generally be the right fit too.
Order the same size in base and outer layers, the outer layer in the same size is designed to fit over the layers that are likely to be worn underneath it.
Small | Medium | Large | X-Large | XX-Large | XXX-Large | |
Chest | 36-38" 91-96cm |
39-41" 99-104cm |
42-45" 106-114cm |
46-49" 116-125cm |
50-53" 127-135cm |
54-57" 137-145cm |
Sleeve |
33" |
34" 86cm |
35-36" 89cm |
36" 91cm |
36" 91cm |
36.5" 93cm |
Waist | 28-30" 71-76cm |
31-33" 79-84cm |
34-37" 86-94cm |
38-41" 96-104cm |
42-45" 107-114cm |
46-49" 117-124cm |
Inseam - Regular | 30" 76cm |
31" 79cm |
32" 81cm |
32" 81cm |
32" 81cm |
32" 81cm |
Inseam - Tall | 32" 81cm |
33" 84cm |
34" 86cm |
34" 86cm |
34" 86cm |
34" 86cm |
Tall Sizes - Tall Pants have an extra 2" (5cm) in leg length. Tall Jackets and Tops have an extra 2" (5cm) in the sleeves and 1.5" (3.8cm) in the body.
Waist Measurement | 30" | 31" | 32" | 33" | 34" | 35" | 36" | 37" | 38" | 40" | 42" | 44" |
Inseam - Regular | 31.5" | 31.5" | 32" | 32.5 | 32.5" | 32.5" | 33" | 33" | 33" | 33.25" | 33.25" | 33.25" |
Inseam - Tall | 34" | 34" | 34" | 34" | 34.5" | 34.5" | 34.5" |
Waist Measurement | 30" | 32" | 34" | 36" | 38" | 40" | 42" | 44" |
Inseam - Regular | 31" | 31" | 32" | 32" | 32" | 32" | 32" | 32" |
Inseam - Tall | 32" | 33" | 34" | 34" | 34" |
Glove Sizing | M | L | XL | Gaiter Sizing | M/L | L/XL | |
Circumference | 8-8.5" | 9-9.5" | 9.5-10" | Calf Circumference | 17.5" | 18.5" | |
Length | 7.5-8" | 8.5-9" | 9-9.5" | Boot Circumference | 20.75" | 22" | |
Gaiter Height | 16.25" |
17.25" |
XS | S | M | L | XL | XXL | |
Chest/Bust | 32-33" | 34-35" | 36-37" | 38-40" | 42-44" | 46" |
Waist | 25.5-26.5" | 27.5-28.5" | 29.5-30.5" | 32-34" | 36-38" | 40.5" |
Hip | 35-36" | 37-38" | 39-40" | 41.5-43 | 45-47" | 48.5" |
Inseam | 31" | 32" | 32" | 32" | 32" | 33" |
25" | 26" | 27" | 28" | 29" | 30" | 31" | 32" | 33" | |
Waist | 25.5" | 26.5" | 27.5" | 28.5" | 29.5" | 30.5" | 31.5" | 32.5" | 33.5" |
Hip | 35" | 36" | 37" | 38" | 39" | 40" | 41" | 42" | 43" |
Inseam | 31" | 31" | 32" | 32" | 32" | 32" | 32" | 32" | 32" |
Glove Sizing | S | M | L | Headwear | OSFM | |
Knuckle Circumference | 6.5-7" | 7-7.5" | 7.5-8" | Head Circumference | 20-22" |
Small (8) | Medium (10-12) | Large (14-16) | |
Height | 45-51" | 51.5-58" | 57.5-64" |
Chest | 25.5-27" | 28.5-30" | 31.5-33" |
Waist | 22-23" | 24-25" | 26-27.5" |
Hip | 26-27.5" | 29-30.5" | 32-33.5" |
Inseam | 19-21" | 23.5-25" | 26.5-28" |