Kelvin Lite Down Pant Subalpine
Kelvin Lite Down Pant Subalpine
Kelvin Lite Down Pant Subalpine on model front-facing
Kelvin Lite Down Pant Subalpine
Kelvin Lite Down Pant Subalpine
Kelvin Lite Down Pant Subalpine side zips.
Kelvin Lite Down Pant Subalpine
Kelvin Lite Down 3/4 Pant
Kelvin Lite Down 3/4 Pant

Kelvin Lite Down 3/4 Pant

  • Big Game : Optifade Subalpine
(10 Reviews)

The Kelvin Lite Down 3/4 Pant is an insulating workhorse for mid-season hunts where warmth and packability are key. Lightweight, compressible 900 fill Primaloft® Gold insulation delivers amazing warmth-to-weight and is paneled in the seat, a high compression zone, to manage moisture and warmth. 7/8th length side zippers allow for easy on/off without removing your boots. The ¾ length of the pant was designed to fit just below your knee pads and above your boot to reduce bulk in your pack. A built-in nylon belt allows for a customized fit every time.

Product ID: #30074

Sizing Guide

Jacket & Tops Sizing

Size Chest Sleeve
Small 36 - 38" 33"
Medium 39 - 41" 34"
Medium Tall 39 - 41" 36"
Large 42 - 45" 35"
Large Tall 42 - 45" 37"
X-Large 46 - 49" 36"
X-Large Tall 46 - 49" 38"
2XL 50 - 53" 37"
2XL Tall 50 - 53" 39"
3XL 54 - 57" 38"

Pant Sizing (Inches)

Size Waist Reg Tall
30 30" 31"
31 31" 31"
32 32" 31" 33"
33 33" 32" 34"
34 34" 32" 34"
35 35" 32" 34"
36 36" 33" 34.5"
37 37" 33" 34.5"
38 38" 33" 34.5"
40 40" 33"
42 42" 33"
44 44" 33"

Pant Sizing

Size Waist Reg Tall
Small 28 - 30" 31"
Medium 31 - 33" 31" 33"
Large 34 - 37" 32" 34"
X-Large 38 - 41" 32" 34"
2XL 42 - 45" 32" 34"
3XL 46 - 49" 32" 34"

Dakota Pant Sizing

Size Waist Reg Tall
30 31" 31"
32 33" 31" 33"
34 35" 32" 34"
36 37" 32" 34"
38 39" 32" 34"
40 41" 32"
42 43" 32"
44 45" 32"

Glove Sizing

Size Palm Circ Length
Medium 8 - 8.5" 7.5 - 8"
Large 9 - 9.5" 8.5 - 9"
X-Large 9.5 - 10" 9 - 9.5"
2XL 10 - 10.5" 9.5 - 10"

Gaiter Sizing

Size Calf Circ Boot Size
M/L 17.5" US 6-10"
L/XL 18.5" US 10-14"

How to Take
Your Measurements


    Bend your elbow and put your hand on your hip. Measure from the center of the back of your neck, along the shoulder and down the elbow to the wrist bone.


    Take measurement under armpits, around fullest part of chest and shoulder blades.


    Measure around where you normally wear your pants, keeping the tape measure a bit loose or putting one finger between your body and the tape measure.

  • 4. INSEAM

    In a standing position,measure from your crotch to where you want your pants to end, breaking at the top of the shoe in the front and just above the heel in the back.

  • 5. GLOVES

    With hand partially closed, measure over the knuckles, around the hand, excluding the thumb.

Fit Guide

SITKA Gear engineers gear with a specific Fit and intended end use in mind. These functional designs provide the user with authentic garments for the right situation.

Fit Descriptions

We can communicate our Fit descriptions in 3 different ways. Keep in mind that each garment will allow for layering in accordance to the garments place in a system and described Fit

  • P/F
  • S/F
  • E/F

    Designed for minimal layering. Whether an early season piece or already insulated this garment fits to prevent inefficiencies in heat retention caused by dead space.


    Designed to accommodate layering for more versatility from early to late season climates.


    Designed for maximum layering in the worst conditions. Cut roomier to accommodate additional layering underneath.

Back to Shopping
  • GORE™ OPTIFADE™ Concealment Subalpine is designed for stalking and ambushing ungulates from ground level in tree-covered and vegetated terrain.

  • Weight: 14 oz. // Size: L

  • Insulation: 900 Fill Primaloft Gold down blend. 60 grams of Primaloft Gold Active Insulation in the seat.

  • Two way stretch nylon face.

  • Two 7/8 length side zips.

  • Zippered fly and nylon web belt.

  • Imported

Wind Protection
Product is Standard Fit, designed to be layered for versatility.



Behind the Design

Mountain hunting is a pursuit that requires ruthless scrutiny at every turn. If ounces mean pounds, warmth means life and the terrain demands high aerobic output, what insulation layer can rise to that very specific challenge? We set out to build a jacket that is exceptionally warm, highly compressible in a pack and as light as possible. This led us to partner with Primaloft to create an entirely new hybrid down and synthetic insulation package not available anywhere else on the market. The Kelvin Lite Down is the answer to the mountain’s questions.

Product Comments

10 Reviews
Write a Comment
Travis Glassman
Reviewed On 11/16/2022

The most packable warmth you can buy. Very practical to own!

Reviewed On 11/13/2022

I love wearing these puffy pants when sitting down to glass. They are super lightweight and pack easily. Not to mention you can literally put them on in seconds. The 3/4 zip had me worried about warmth but after walking through some deep snow they made sense to me with gaiters on. They do have their flaws though... #1. They aren't meant to be worn bushwhacking, take them off before you run down the drainage chasing after that buck or bull. #2. Because the side zipper stops an inch from the waistband and doesn't completely separate the leg side, it is impossible to layer these pants under your waterproof shell without taking off your gaiters, the shell, and then slipping them on. This was frustrating in a recent snow storm where these puffy pants completely soaked through as I was being pelted with heavy wet snowflakes. #3 if these pants are meant to be worn on the exterior of all other layers, it would be well worth the weight to add a waterproof and abrasion resistant material to the butt and knee section where you will typically be sitting or kneeling on snow during a cold glassing session. After sitting next to a warm fire while glassing for a few hours I slowly felt moisture seeping into my base layer from the snow melting beneath me. And last but not least, #4, It would be extremely helpful to have a side pocket to stick your phone in for easy access while sitting down. I typically have my bino-harness on and cant easily access the chest zipper pocket on any of my other layers. If these could be fixed I would give it a 5/5!

Reviewed On 10/14/2022

Used these on a early season elk hunt. Just in the morning glassing, extremely warm cut the wind. I'm excited to see if the warmth holds true when temps get below freezing. Packable lightweight, still on the fence about the 3/4 thing. I tucked them into my gaiters.

Reviewed On 10/14/2022

Used these on a early season elk hunt. Just in the morning glassing, extremely warm cut the wind. I'm excited to see if the warmth holds true when temps get below freezing. Packable lightweight, still on the fence about the 3/4 thing. I tucked them into my gaiters.

Canadian Sheep Hunter
Reviewed On 09/25/2022

These are essential pants for high altitude and late season hunts. Sheep, goat, and mountain elk hunters understand that every ounce counts when you ascend the mountain. You sweat at -20 and in knee-deep snow. Once you stop to glass these lightweight down pants comfortably slip over your hunting pants, calf-high boots + gaiters to keep you warm as you sit on the side of a mountain. When in pursuit, these pants come off easily with the side zips, fit nicely in your bag as you chase the ram of your dreams over the next pass. Once you bagged your trophy, these pants take up little real-estate as you stuff your pack with cape, horns, and meat. When worn under your Kelvin Aerolite 30 Bag, you can spend the night camped under your future trophy, ready for a crack of dawn start. The design, weight and warmth of these 3/4 length pants is excellent for cold weather spotting sessions. If you are looking for durability you are going to pay for it in weight. If you are going to hunt out of your truck in thorns in a valley bottom, wear Carhartt coveralls.

Ben C
Reviewed On 01/08/2022

Wore on a late October Wyoming Backcountry hunt where temps ranged from 0-20°F overnight and in the mornings. Light, compressible and easy to put on upon arrival at the glassing spots for extra warmth. Paired very nicely with 30 degree bag overnight in low single digit temps in the tent. Never was cold, once. Huge fan of these pants.

Reviewed On 08/29/2021

Game changer! You don't know what you're mising until you've tried them. I always new I wanted to try puffy pants since they started to get more popular. I was skeptical about the 3/4 length with these but I'll be honest, they really grew on me. Late season when its wet, cold, snow, mud whatever nasty conditions, these works flawless when wearing gaiters. They are very warm and very light also. Super easy to pack and easy to throw on over wet boots keeping them clean to throw back into your back when you take them off and start moving again. No complaints here, they'll be with me late fall through early spring no matter what now.

Reviewed On 07/31/2021

These pants are very fragile. Ordered them on March 15, 2021 and wore them during a blizzard chasing turkeys in mid-May (Montana). The first time I wore these pants the underbrush cut a 1x1 inch tear in my lower right leg above the cuff. Pretty shameful a piece that cost so much money cant even withstand the simplest of brush. Needless to say, I had a ton of filling flying out, even though the hole was very small. I went to make a warranty claim and Sitka does NOT cover tears in their products. Guess I will throw a patch on them until I can find a better solution. Plus they are loud too, I would NOT recommend these pants to anyone, there are much better options on the market. Sitka struck out with these big time. I suspect the other Kelvin Lite pieces I have are just as vulnerable and weak.

Tony Celeste
Reviewed On 08/29/2020

I'm 5'10 and 175 lbs. I have a bunch of Sitka gear. In pants, I have the Mountain, old style 90%, Ascent , Territory and even an old style Kelvin lite. I was so impressed with the updated version of the Kelvin down lite hoody I went for a pair of the Kelvin 3/4 lite pants too. The quality is great and the design clearly sheds weight, it is definitely more compressible than the full length Kelvin lite. They also should be keep you warm. But the design features feel over done for me and I decided to return them. If you are looking for the absolute lightest warmth to weight ratio you can, this is a great piece. For me I would rather have the little bit of extra weight and slightly less compressible for a little more versatility. I really did not like the style and the zipper location might have its advantages for venting while sitting but then reaching into you inner pockets is difficult. I'd like to see a full length version of the Kelvin lite pant with the new down and mapping but the zipper straight down the side. I think for most hunters except those that care about shedding an ounce or two would feel similar.

Reviewed On 05/31/2020

Finally! I've been waiting for the new puffy pants to come out for sometime and these ones are very nice. The fit is really good and doesn't bunch up; XL for 6'/210lbs. Spent some time with this and the jacket in high mountain and desert of WY down to 30°. Sitting and glassing was great with them. I wouldnt hike in them, obviously, and I would be careful of snagging the outer layer. It's thin, but it did fine while I was out. My only complaint is I'd prefer the full length, but that's fairly minor compared to what you get out of these pants.

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Sitka Team - 07.14.2015

The Darkroom: A Navy SEAL Rewarming Drill

"The deal is, if you spend enough time out there, you’re going to get wet on a brutally cold day. And how are you going to keep warm? How are you going to get everything dry and keep going?” - Big Game Product Manager John Barklow