Heavyweight Bottom
Heavyweight Bottom
Heavyweight Bottom

Heavyweight Bottom

  • Waterfowl : Waterfowl Marsh
(28 Reviews)

The Heavyweight Bottom is a foundational next-to-skin baselayer that keeps the lower limbs warm during long periods of frigid inactivity while wicking moisture when on the move. With a comfort stretch fleece for warmth and channeled construction for added breathability and moisture management, the Heavyweight Bottom is perfect for cold weather days spent in a layout blind, stand or glassing in the backcountry.

Product ID: #70015

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 Waterfowl Marsh is designed for layout and blind hunting in the marsh, standing crops, and cut stubble fields.

  • Weight: 9.15 oz. // Size: L

  • Fabric: Heavyweight Comfort Stretch Fleece (93% Polyester/7% Elastane).

  • Polygiene® Odor Control Technology safely neutralizes odor caused from sweat.

  • Quick-dry, Comfort Stretch Lightweight Knit: Stay warm when the temperatures dip.

  • Imported

Moisture Wicking
Product is Performance Fit, designed for minimal layering.



Product Comments

28 Reviews
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Jeff Guesman
Reviewed On 01/31/2023

Extremely comfortable. Very warm. Utilized late archery and squirrel in Ohio and best decision this far. Highly recommend as a part of ones layers.

Marc K
Reviewed On 01/18/2023

These bottoms are the most comfortable insulated bottoms I have ever worn. From the first generation poly pro to the very latest Army issue, these are far superior.

Reviewed On 01/14/2023

Super comfortable!

Brian M
Reviewed On 01/09/2023

5 stars all the way. Great piece

Reviewed On 01/09/2023

I recently purchase a pair of the Heavyweight Bottoms for a whitetail hunt in KY. Temps were in the teens every morning, the Heavyweight bibs coupled with the Stratus bibs kept me comfortable all day long. I will be ordering another pair soon.

Reviewed On 01/08/2023

Best I own....and I own plenty. Fit is good tight but not too tight. Very warm.

Reviewed On 12/28/2022

Christmas present for the boyfriend and man does he love it! He is in-between sizes and sized down to the medium and its perfect even with a little extra room to spare. First day out in them it was 15 degrees and he stayed warm for a few hours.

Reviewed On 12/18/2022

Great base layer for when your are moving around a lot, help keep you warm in cold weather without causing you to sweat. Extremely comfortable and form fitting.

Caleb Strassner
Reviewed On 12/11/2022

Great product , fit is perfect. Great option for southern cold days, will definitely need the merino bottoms for west Tennessee.

Reviewed On 12/07/2022

Have 3 pairs of these. They’re not only warm but extremely comfortable. They layer great. Sitka hit the mark on these.

Reviewed On 12/06/2022

Very comfortable and warm.

Reviewed On 12/02/2022

Great feel, Good pair of thermals, I will pick up another pair.

Reviewed On 12/01/2022

I have been wearing long johns and leggings like this for years for football basketball and just going out hunting and I am a large and all these so I got my normal size a large and they are huge on me very disappointing but I was able to shrink them to make them fit

Alex S
Reviewed On 11/30/2022

I purchased this for ice fishing and hunting seasons. I wore this with 20 degree temps, 25 mph wind, and snow. I was plenty warm. This is the pair you are looking for when the temps dip!

Reviewed On 11/23/2022

Nothing bad to say about these, I wear them over my LW leggings when it gets cold and they do a great job at keeping you warm. I also wear them in my sleeping bag when it’s cold out. Keeps some funk out of my bag and adds some warmth to me. I wear 36x34 Levi’s and Sitka L bottom bases fit great.

Reviewed On 11/20/2022

Its been hitting into the negatives hear in SE Idaho south of Yellowstone. We had an early freeze that's made hunting insanely difficult and insanely frozen. However, I have yet to be cold. I wear these under my gradient pants in the waders and at -5 I could almost pass out in the blind I'm so comfortable! Absolutely wonderful. Wish I could get these in a long sleeve top as a base layer.

C. Pierce
Reviewed On 11/16/2022

I’ve tested these down to 23 F. Couldn’t be happier with the purchase so far. All Sitka gear I own is 5-stars. This piece is no different.

Bayron Salazar
Reviewed On 11/14/2022

I love this base layer. Highly recommend it

Clint Albrecht
Reviewed On 11/06/2022

Great Product, worth the money.

Len Cottrell
Reviewed On 03/14/2022

Great base layer. It is a bit snug, but it is supposed to be. They get it done in cold temps. I have used these in mid to late seasons. I have even used the as sleeping pants during camping. They don't ride up or bunch up behind your knees. You get what you pay for and these are well worth it.

William Comstock
Reviewed On 01/20/2022

I feel like I'm wearing super hero gear. I've decided I'm exclusively wearing these pants going forward.

Robert Thomas
Reviewed On 06/26/2021

These basel ayers are bad to the bone. They kept me extremely warm this past season with all the crazy cold weather we had. I highly recommend them for extremely cold weather or if you sit for any prolong period of time with not much hiking. I hike mountains and it was a bit to much while hiking even though it was single digits and about a foot of snow on the ground.

Andrew Abraham
Reviewed On 04/01/2021

Love these!

Reviewed On 03/21/2021

Being a Minnesota boy I know the importance of a good base layer. These are really nice. They breath well during walks to the blind and then distribute the sweat, and keep me warm during the long sits. You will not go wrong with these base layer pieces.

jacob rutz
Reviewed On 11/29/2020

You get what you pay for!! Folks always talk about the price. If you're a couple times a year guy yeah it’s high. But if you're all season or yr round hunting it saves you time and money. I haven’t had to buy new camo in over 6 years. I bet if I take care of my stuff I bet I’ll never have to buy again. I used to have to buy new stuff every or every other just from how the cheap stuff fades and wears out. It’s simple math. Spend now and not have to spend later possibly ever again. The only time you’ll need to spend more is if you want to add to your collection.

Reviewed On 05/04/2020

They’re unbelievably comfortable. Sitka is worth the price. I am Sitka for life.

Reviewed On 01/13/2020

Sitka Price Stings a little bit but I’m slowly going all in on the whitetail system. In SW PA The weather is unpredictable and I wore these for a few hour sit after work on top of some UA ColdGear and didn’t even need my coveralls to stay warm in low-mid 20s I’ll definitely be adding the heavyweight top and the full Stratus Line for next season since there’s only 2 weeks left in the season here.

roger hall
Reviewed On 11/15/2019

I finally broke down and went all in on this sitka system, and other than the price, I could not be more happier. The heavy weight bottoms I wore from mid October on as my next to skin layer. Mornings get a little chilly in ne Ohio and they did a surprisingly good job of wicking sweat. Warmer than my merino wools, I'm a freeze baby, and I will buy another pair if I wear these out.

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SITKA Team - 10.08.2019

The Necessities of Comfort: Gear Tips To Improve Your Next Hunt

Comfort can play a vital role in the hunt. Not in the sense that being comfortable makes the hunt easy, more that it allows us to shift focus from the challenges of the hunt to the task at hand. When we bring our bodies and minds to a state of comfort, we become more effective, more efficient, and more durable to the conditions. Comfort becomes a tool.