Kelvin Aerolite 30 Sleeping Bag
Aerolite Collection
Kelvin Aerolite 30 Sleeping Bag
Aerolite Collection
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
Kelvin Aerolite 30 Sleeping Bag
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Kelvin Aerolite 30 Sleeping Bag

  • Big Game : Lead
(9 Reviews)

To be notified when an out-of-stock product is available, please select your size and click the "EMAIL ME" button.

The Kelvin Aerolite 30 Sleeping Bag is a multifunctional layer for active time in camp, cold glassing sessions or dreaded midnight nature calls. Synthetic PrimaLoft® Gold Insulation with Cross Core™ technology replicates the aesthetics and performance of down insulation, but with warm-when-wet performance. Featuring a 30-degree comfort rating, it’s designed to be an extension of your SITKA clothing systems for full-season performance, even in the wettest conditions. Jacket-like features include zippered, functional armholes; contoured shoulders and hood, and a center-front two-way zipper.

Product ID: #40086

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"

Equinox & 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
  • Reg: up to 6'

  • Long: up to 6'6"

  • Total weight: 38 oz.

  • Synthetic PrimaLoft® Gold Insulation with Cross Core™ technology replicates the warmth and compressibility of down, but with the benefit of warm-when-wet performance

  • Lightweight insulation (35% recycled) is infused with silica aerogel, a nearly weightless material that’s composed of more than 95% air and acts as additional thermal insulation

  • ISO 23537, 30-degree comfort rating; designed to be worn with other layers in your SITKA clothing system for colder conditions

  • Stowed hook at bottom of bag connects to midlength interior loop; shortens the bag for walking

  • Durable water repellent finish resists precipitation and prevents face fabric from wetting out

  • Contoured shoulders and hood for a shaped and functional jacket-like fit when active

  • Armholes positioned for functional mobility; baffled draft tubes seal in heat

  • Shaped footbox provides even warmth around your feet

  • 20-denier polyester face and backer

  • Center-front two-way zipper

  • Imported

Product is Expedition Fit, designed for full layering in all conditions.



Why We Made This

“Building a system is not something you do as much it’s a way you think.”

- John Barklow, SITKA Big Game Product Manager

We took experience and insights designing clothing systems and applied that knowledge to the sleeping bag, turning something you typically use just for sleep into a multifunctional tool for backcountry use.

Product Comments

9 Reviews
Write a Comment
Coy West
Reviewed On 11/16/2021

I tested this sleeping bag out this weekend. I slept outside under the stars and never once felt cold as the temperature dropped to a breezy 40°F. In fact, I was a little too warm at first. The zipper down the middle and the zippers for arms is an absolutely genius design. I was able to reach for my water or headlamp without having to open up the sleeping bag and let out all the heat. Whenever I needed to get up in the middle of the night to answer nature's call, I simply opened up the bottom, hooked the bottom up, and walked out to do my business. The next morning I spent the greater part of 3 hours walking around the cold campsite with my sleeping bag while everyone else was bundled up shivering. I was skeptical at first, but this sleeping bag proved its worth very quickly.

Brad Wilson
Reviewed On 10/08/2021

Love it!!!! It works so well with my clothes and kept me warm all night in -22°F weather.

James Parker
Reviewed On 10/08/2021

This is the most important change to sleep systems in the last 10 years. Watch as everyone else starts to copy Sitka's brillance. Maybe a future down version please. I'd love to help test it.

Mike Truant
Reviewed On 09/02/2021

I agree with the first review. Not all of us like to crawl into bed every night in our sweaty clothes. Some nights OK but not every night. A bit more fluff would be good.

Reviewed On 08/05/2021

Improvements I think could be made in offering this in some sort of camo. Black is the worst color for blending in especially if using for a glassing or from a tree stand.
Additionally 30 deg isn’t bad when used with clothes under bag but a slightly lower rating could improve its versatility.
Camo offering being number one Improvement.

Jonathan Ishee
Reviewed On 07/16/2021

Barklow and the whole Sitka team have created a fantastic system based solution with this bag. It’s light, it’s compressible, it’s synthetic (bombproof performance), and it’s extremely versatile for a wide range of temps when used as suggested as part of the system. I’ll be ordering another as my wife stole my first one.

Dale Jackson
Reviewed On 07/14/2021

Its genius and I'm looking for a local dealer!! I have a WW2 German "sleeved" bag that zips open 3/4 pant leg and has tie strap to make a seat, Can't wait to partner it with your 'wearable' bag.

Reviewed On 06/23/2021

The first reviewer doesn’t ‘get it’! This bag is meant to function with your clothing system so you don’t have to have a -(30) degree bag that is heavy… you use the puffy to augment the bag since you’ll need your puffy as an integral part of your system — why don’t people pay attention to the functionality and design?!

Reviewed On 06/15/2021

Badass bag, but a 30 degree bag doesn't cut it for Alaska’s back country, hope something warmer comes out very soon

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SITKA Gear - 04.13.2020

The Darkroom: Built with Purpose

If you walk into our design room, you'll hear our designers throwing around terms like "fit," "features," and "purpose built." But what does that even mean?