Grinder Half Zip
Grinder Half Zip
Grinder Half Zip
Grinder Half Zip
Grinder Half Zip
Grinder Half Zip

Grinder Half-Zip

  • Waterfowl : Waterfowl Marsh
(9 Reviews)

The Grinder Half-Zip was born to pull double-duty for waterfowl season. Worn between a next-to-skin layer and a shell for core insulation or as a breathable, water and abrasion-resistant outer layer. Lofted fleece adds comfortable warmth during long sits in the blind, yet, still breathes during active work setting up decoys while retaining stretch for complete range of motion.

Product ID: #70020

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.

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

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

  • Imported

Moisture Wicking
Air Permeability



Why We Made This

Hunters have been looking for a durable lighter-weight insulation piece to get them through the rigors of waterfowl season. Our approach was to use the combination of lofted fleece for the interior to deliver core-warmth and superior abrasion resistance technology on the exterior for ultimate durability. A DWR finish provides water resistance from light precipitation that won’t wet-out the face fabric. The high collar delivers warmth and shelter from the wind while the half-zip design won’t interfere with your shots when the birds are in sight.

Product Comments

9 Reviews
Write a Comment
Kyle Kendall
Reviewed On 01/21/2023

Good product! Wish it had more pockets!

Robert Schelstrate
Reviewed On 12/31/2022

Perfect layer for warmth in the early season and the material sheds light rain well. The athletic fit provides excellent mobility in the chest and shoulders. Will probably purchase in Timber as well as Marsh to work in other environments. Recommend.

Reviewed On 12/29/2022

Great mid layer that keeps you very warm.

Reviewed On 12/19/2022

Works well as a mid layer under my Duck Oven Jacket. I wear a base layer under this when temps drop.

Reviewed On 10/20/2022

As a mid-layer I love it. It's fitted so it fit very well under my Dakota Hoody when it was cold. Hoops for the arms made it nice for getting my jacket over it. Zipped up it provided good neck protection on a cold day. And as a mid-layer I like that it doesn't have a hoody. I gave it 4-stars, because it got warm and I decided to wear it as an outer layer and I found it to not have very good durability. A day of walking through the marsh and the arms were frayed. The Waterfowl Marsh color is off from the rest, it's darker... minor nit.

Paul mastrella
Reviewed On 06/28/2022

I absolutely love this mid layer. It’s the perfect thickness to wear under a coat and then when it warms up you crake the coat off and wear it as a top layer. Fits perfect for shouldering a shotgun too. This and the Hudson bibs are my absolute must have pieces of hunting clothing.

Scott Stephens
Reviewed On 11/15/2021

Bought one of these and have found this to be my favorite pullover. I'm 6'4" and 190 lbs. The sleeve length is long enough which is usually a problem for lanky tall guys like me but this one fits perfectly. Quickly ordered a 2nd one in my next order. Wear them all the time!

Brian S.
Reviewed On 10/21/2020

Another great "base layer" from Sitka. This piece is utilized on all hunts, but the earliest of the season. A very comfortable, soft layer that moves with you. No binding. No cinching. Really nothing else to say for it as it is a basic piece. However, it is a piece of the "system" that truly helps keep you out there throughout the season!

Michael J Wolf
Reviewed On 12/14/2019

In one word... Magic! Somehow this shirt keeps me warmer on cold days and cooler on hot days. My Grinder half zip is worn every opportunity I get, the most comfortable garment I own, even with the zipper against my bare skin. Love the thumb loops for layering without dragging the sleeves up my arms.

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John Stephens | Photos By Steven Drake - 09.25.2019

Following the Call: Honoring a Waterfowl Tradition

My love of the history and tradition of the American duck call goes way back. I was eight years old when my parents handed me an old shoe box of calls that had once belonged to my grandfather and his brother. The calls fascinated me, and it wasn’t long before I started my own vintage collection and began attending duck calling competitions. Eventually, I was spending what would become invaluable time with Butch Richenback at his Rich-N-Tone Duck Call shop here in Stuttgart, Arkansas, learning everything he had to teach me.