Core Lightweight Crew - Long Sleeve
Core Lightweight Crew - Long Sleeve
Core Lightweight Crew - Long Sleeve
Core Lightweight Crew - Long Sleeve
Core Lightweight Crew - Long Sleeve
Core Lightweight Crew - Long Sleeve

Core Lightweight Crew LS

  • Big Game : Optifade Open Country
(31 Reviews)

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Built from the same moisture-wicking fabric as the Core Lightweight Hoody, our Core Lightweight Crew LS makes for a solid base layer. Whether used as a standalone piece during hot weather or layered into your system, the Core Lightweight Crew will perform across all seasons regardless of the pursuit.

Product ID: #10064

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 Open Country is scientifically optimized for engagement ranges of 50 yards and beyond at ground level in rocky terrain above the timber line.

  • Weight: 5.1 oz. // Size L

  • Fabric: Quick-Dry, Lightweight Comfort Stretch Knit (100% Polyester).

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

  • Imported

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



Why We Made This

Hunters are in need of a foundational next-to-skin piece that can span temperature variations throughout the seasons in order to regulate heat and sweat. Our approach was to build a base layer that, when worn, feels like you were hunting with nothing on. We used durable polyester bi-component construction with Polygiene® Odor Control Technology to deliver breathability, moisture management, and odor control. This crew can be worn as a standalone outerwear piece or layered into a system for all-season hunting.

Product Comments

31 Reviews
Write a Comment
Brian McAvena
Reviewed On 01/09/2023

This is the foundation of every kit I own. The thumb loops are such a simple and genius stroke of perfection. Love them. Dries incredibly fast.

Isaak Lorton
Reviewed On 12/27/2022

This is most likely just a ME problem, but I wasn't the biggest fan of the thumb loops. While they are good for their intended purpose of keeping the sleeves down, they did tend to rub a bit until it felt kind of raw. I feel like having the thumb loop pulled more down into the sleeve like on the traverse hoody would have been more comfortable but again, this could just be a personal preference for me. Overall, it is a great base layer, very lightweight and keeps my sweat away from me. Despite my feelings with the thumb loops, I will most likely buy more going forward and will continue to wear this one. I recommend this product.

Reviewed On 12/24/2022

5’10” 165# bought the large and it fits well. Love it’s breathability and lightweight.

Caleb Strassner
Reviewed On 12/16/2022

Fit is a little tight due to broad shoulders, went with XL could stand to go one size up. Overall quality is good, the thumb straps are nice and prevent bunching up of the sleeves when layering.

Reviewed On 12/04/2022

Great fit, and extremely comfortable. Useful for warm Texas early season hunts and a baselayer for everything else. I'm 6'1 and 185, thin build. I went with Large Tall for extra length on the arms which firt perfect.

Reviewed On 11/21/2022

Great product. Barely holds any odor after a 3-4 day hunt only taking off and airing out at night. Not the MOST comfortable on the skin for me but it does its job well at wicking moisture and controlling smell.

Reviewed On 11/21/2022

Great shirt, fits tight. Should have went up 1 size.

Shane Smith
Reviewed On 11/02/2022

I bought this pieces as a light weight top for warm weather and a base layer for the colder weather and it’s working great for both! I am also a tall guy so the longer length really works great for me.

Reviewed On 10/30/2022

Bought this for a “next to skin” layer. I camp while hunting and go several days without showering. I like this layer for sleeping and wearing out hunting. They don’t really hold a smell and are surprising warm. If needed I’ll add a heavyweight on top and it never feels bunched up or constructing. I call them my “silkies” because they remind me of the silk weight base layers the military issued with the ECWCS system. I’m 5’10” 190-195lbs with an athletic build and large fits perfect. They have a slightly snug fit, but I wouldn’t call them tight.

Jim G
Reviewed On 10/17/2022

Great in the Texas heat. Still felt cool and comfortable when wet from sweat and then dried quickly. Very quiet material.

Mark Lukas
Reviewed On 08/09/2022

Incredibly breathable! Unexpectedly found myself out in 90+ degree heat and 92% humidity after a storm cleared earlier than anticipated. I was shocked how comfortable I was. Only area that was hot and wet was my back and that’s due to my Ascent 12 daypack on my back.

Matt F
Reviewed On 06/02/2022

This baselayer has been great on my last few hunts. This is a must have. I have used and abused this shirt and it is still going strong, I'm really impressed. I will be buying more. These shirts will keep you warm and dry quickly if you get them wet.

Reviewed On 05/11/2022

Good material. Bought a Large. 6ft, 200lbs and I thought it ran small.

Kevin Bailey
Reviewed On 02/02/2022

Guess I didn't have the luck the other reviewers had. I had one in a size medium and I am 5'9, 160lbs. It was a good fit. After only wearing it one time, the stitching under the right arm became loose and a hole started. Second time wearing it just made it worse. It was too uncomfortable to wear and an obvious defect in the stitching. I have no idea where these are made but was not happy. Can only give 2 stars and shouldn't give any.

Hunter Lacy
Reviewed On 01/15/2022

I purchased this shirt and the core lightweight hoody today from a local store and I love the hoody. It fits great and this LS shirt also seems great. The only complaint I have about it is the fit around the chest is a little tighter than the hoody. I honestly think in the future I will just purchase the hoody over this shirt as it is not much more and the fit is superior and comes with hood and built in mask.

Reviewed On 10/07/2021

The lightweight long sleeve worked great for an unexpectedly warm WY pronghorn hunt. Was perfect when paired with the Jet Stream jacket for the 40's & 50's in the morning and wore just the lightweight the rest of the day with 70's & 80's. Any wind had a noticeable cooling feeling. Highly recommend for anything during warm hunts.

Reviewed On 09/04/2021

This is a great base layer. It fits well, wick moisture and controls odours very well. I am however disappointed in its durability. After only one day of trekking through brush, it has many threads that have been pulled which caused the fabric to pucker slightly. Given this is designed for hunters and is a premium brand, I expected it to be much more durable.

Desert hunter
Reviewed On 08/25/2021

Absolutely nothing to complain about! This is the best shirt for Arizona archery season. I would give it more stars if I could. There are five of us in the hunting group and we all love them.

Reviewed On 06/11/2021

Best synthetic base layer I have worn. I have tried other "poly blend" base layers and they aways end up smelling like a stale locker room after a few days in the field. This base layer can be worn for multiple days without feeling like I am going to blow anything downwind out of the unit

Reviewed On 05/31/2021

This is a must have for hunting out west during archery season. Breathability and comfort is key for warmer temps.

jeffery ingle
Reviewed On 05/25/2021

I wear this shirt for early season and as a layering piece next to skin. Its super comfortable and a great early season shirt. The hand loops make it very easy for layering other pieces.

Ben Weller
Reviewed On 05/25/2021

Fits great and is lightweight and breathable. Works well as a layer or a stand alone piece.

4Zach Miller
Reviewed On 03/18/2021

I cannot get enough of these!!!

Reviewed On 12/29/2020

Have this base for over a year and I’ll tell you, it’s my goto piece. From spring turkeys and bear, to early fall elk into winter whitetail, I have this thing on all the time.
Fit is perfect. I’m 6’ 205# and wear a Large.
I’m going to pick up a couple more to have in different patterns.

William Workman
Reviewed On 12/13/2020

I am impressed. The fit is excellent. Not too tight, not too lose. True to size. Thumb loops are excellent, not too big or in the way.

Jim M
Reviewed On 12/08/2020

Fit is great per the Sitka size chart. Fit is snug as a long underwear base layer should be but not overly snug. This product seems more durable than similar products on the market and I believe posses the scent control qualities it claims. I have worn as a base under other clothes and as a stand alone piece and found it to be acceptable for both. Good moisture wicking capability you want out of a base layer. I would definitely recommend.

Reviewed On 09/22/2020

Excellent early season base layer. Perfect standalone 60+ degrees, wear a hoodie overtop if you get cold. Only complaint is when wearing alone, these things fray easily on any snags. Love this shirt overall for early season whitetails and will wear during spring turkey.

Reviewed On 04/07/2020

This is the most versatile base layer for any system. This core light top pulls moisture from your skin and wicks it away very fast. This keeps you from feeling wet underneath all your gear and regulate your temperature well. Anytime I know I will be exerting a lot of energy or I will be near water, I wear this base layer because I know if I sweat or get soaked while setting decoys I will be dry Within a few minutes.

roger hall
Reviewed On 11/15/2019

I finally broke down and went all in on the system, and I couldn't be more pleased. Except the price tag. But I have both the short and long sleeve t shirts and they are a must for your 1st layer. The sweat in the heat, or from layering up is quickly taken away. This shirt drives in almost seconds.

Dalton Hand
Reviewed On 09/22/2019

This is a must have item along with the lightweight base layer pants. After a week long early season elk-hunt, my shirt and pants barely even had a stench. It dries super quick and definitely controls odor!

Reviewed On 05/09/2019

This is a sweet comfortable base layer. It feels nice and soft and the fit is perfect. I'm 206lbs & 5' 10.5" and the XL is perfect. This shirt will be awesome in the heat for the the early season, and a great base to start the layer system. A++.

1 of 8
Adam Foss - 04.26.2019

A Tale of Two Roars

Rustic wooden gates groaned open as our Toyota HiLux rumbled through. We navigated the rutted, winding dirt road; every pothole and washboard negotiated revealing another layer of the towering Andes Mountains. A gin-clear river meandered through the valley floor. Willows on the cusp of fall color shimmered in the cool afternoon breeze. This was the start of the annual breeding season for red deer in northern Patagonia—also known as the roar.