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Men’s Midweight Stretch Baselayer Long Sleeve Shirt


https://www.columbia.com/mens-midweight-stretch-baselayer-long-sleeve-shirt-1638591.html 1638591
$40.90 $55.00
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Style# 1638591
Uses Winter


It’s wicking, warming and ergonomic qualities make it a versatile, year-round, long-sleeve shirt. Wear it as an active fit baselayer in the winter, or as a standalone during workouts and recreation throughout the spring and fall.

  • Omni-Heat™ thermal reflective
  • Omni-Wick™
  • 4-way comfort stretch
  • Antimicrobial treatment protects this product from bacterial growth
  • Ergonomic seaming
  • Flatlocked construction
  • Center Back Length: 29"
  • Imported
  • Uses: Winter
  • Style# 1638591

  • 85% polyester / 15% elastane Omni-Heat™ Reflective Anytime Stretch Jersey
  • 85% polyester / 15% elastane stretch jersey Omni-Wick™ Anytime
Omni-Heat™ Reflective
Thermal Reflective Warmth
High-Performance Wicking Fabric

Technology Videos

Play youtube video about Omni-Heat Reflective (tm)
Omni-Heat™ Reflective
Magic in a littlesilver dot.
Breathable material with little silver dots that reflect body heat.
Play youtube video about Omni-Wick (tm)
Pulls moisture away from the body so sweat can evaporate quickly.


Men’s Midweight Stretch Baselayer Long Sleeve Shirt is rated 4.6 out of 5 by 30.
Rated 5 out of 5 by from excelent excellent quality and comfort when using as always. highly recommended for outdoor work on cold days
Date published: 2018-07-24
Rated 5 out of 5 by from Great From the first time i tried it on, I loved this shirt. Fits great, is lightweight, and keeps you warm. It isn´t that warm all in itself, but is designed to warm you up while you´re working it seems. The other good thing is it isn´t uncomfortable when it starts to warm up outside.
Date published: 2018-06-10
Rated 5 out of 5 by from Baselayer top Good fit and feels nice.
Date published: 2018-03-07
Rated 5 out of 5 by from Men's mid weight base layer shirt Fits great and goes along well with the thermal bottoms recently purchased
Date published: 2018-03-04
Rated 5 out of 5 by from Great in the Cold I used it in the cold snow blowing a driveway. Great fit keep me warm.
Date published: 2018-03-03
Rated 5 out of 5 by from Full value for your money This set fit so nice and you will not fell you have it on. Keeps you nice warm and comfy even in a cold Saskatchewan winter. I love it. (This review was collected as part of a promotion.)
Date published: 2018-03-02
Rated 4 out of 5 by from Warm baselayer I got this baselayer shirt for large size. It feels a little snug but very warm. If I would get the next size it would be too big. The quality feels nice. (This review was collected as part of a promotion.)
Date published: 2018-01-27
Rated 5 out of 5 by from Fits great, no itch The fit is great. The locations of the reflective fabric is perfect (back, chest & arms). The wicking fabric is also perfectly located (armpits). Particularly like that the collar is not too high up. I have a 17 in neck and this collar doesn't choke me like other brands.
Date published: 2018-01-25
Rated 5 out of 5 by from Best base layer out there I LOVE the omni heat base layers. They offer so much warmth in a thin, soft and comfortable material. I won’t wear anything else on a cold day. Go with the midweight if you need extra warmth though.
Date published: 2018-01-24
Rated 5 out of 5 by from Nice & Warm This is absolutley perfect for wearing under sports clothes in the winter, light enough that it doesn't bother you with bulkiness, but extra warm, highly recommended. (This review was collected as part of a promotion.)
Date published: 2018-01-24
Rated 4 out of 5 by from Great IF temps above freezing Comfortable but only warm enough for mild days
Date published: 2018-01-21
Rated 4 out of 5 by from Sleeves too long I am 5'7 and 170lbs with an athletic build. I bought a size medium and the fit is perfect around my chest and torso. The sleeves run way too long on these that it bunches up on my wrist. Tried a size small and the fit around my chest and torso isn't the same but sleeves were the right. This is a good baselayer that kept me warm and dry during many winter activities. Too bad about the sleeves.
Date published: 2018-01-10
Rated 5 out of 5 by from Second Skin Fits right on your skin comfortable. Nice layer to hike in. I found it kept me warm and wicked enough of my perspiration away. The fabric moves with you so you do not feel constricted. I am enjoying this Columbia product.
Date published: 2018-01-07
Rated 5 out of 5 by from Great quality I'm gifting this to my Dad on Christmas because he raves about the one he already had. Slam dunk gift success!!
Date published: 2017-12-16
Rated 1 out of 5 by from Omni Heat Disaster!! 2x I have purchased no less than 2 dozen Columbia shirts - not all Omni Heat.. I just opened the Omni HeatI ordered most recently (Black). It is cut as a medium. This shirt was made in China. This is the second time this has occurred. The Omni Heat shirt I ordered initially (Black) was made in Sri Lanka and still fits perfectly. The Omni Heat order before this was grey - made in China -same issue -it is a medium cut but labeled L/G. I am done w/Columbia.
Date published: 2017-11-11
Rated 5 out of 5 by from One of my favorites This is definitely one of my favorite base layers and I absolutely love the way it fits. It also does a very good job of protecting me from the elements and keeping me warm. It does run a bit small but that also depends on how tight of a fit your prefer. I enjoy a base layer that is more of a tight fit so it is perfect for me.
Date published: 2017-04-22
Rated 4 out of 5 by from Sleeves long The sleeves on these shirts run very long. I don't recommend this product unless you have long arms, otherwise it's a very nice, comfortable and functional under layer.
Date published: 2017-03-07
Rated 4 out of 5 by from Staying warm! Happy with all of the Columbia base layer options. We've used them exclusively over the last two seasons snowmobiling with no complaints. Warm and durable!
Date published: 2017-01-31
Rated 5 out of 5 by from Excellent Skiing Baselayer I'm a slender athletic male that is outdoors a lot for my business - Coaching Skiing both indoors and outdoors using the Snow Biste equipment I design and manufacture. I also train ski racing as an active USSA Masters racer in the Far West division. The product fits perfectly, maybe a little tight for larger chested Med sized men. Its warm and comfortable and never feel damp.
Date published: 2017-01-26
Rated 5 out of 5 by from Great warmth and comfort Purchased this for my son-in-law. He loves it, and they had a sledding mishap, and were stuck out in the snow for an hour and he was happy he was wearing this top. Also, my daughter says it looks sexy on him!
Date published: 2017-01-02
Rated 5 out of 5 by from Omni Heat works! I got this for my husband, whose measurements indicate a medium would be plenty big. It wasn't. We went to a local store and tried on several of the Omni Heat baselayers and bought a large. The best value and fit was the zip up. It has a short "mock neck" type collar, and looks great. I bought one and was cozy down to about 42 degrees with a light sweater and light jacket. Could possibly have tolerated lower temperatures.
Date published: 2017-01-02
Rated 5 out of 5 by from midweight excellent If you are active in cool to cold temps then this is good to have.. As for the omni-heat factor you have to sort of work for it like stay active to keep you warm if you are just standing around or sitting around then you need to go up the scale to heavyweight or arctic base-layer. if you have got insulated clothing on like insulated snow paints...coveralls then this midweight would work for you it has work for me wearing insulated clothing in 30 degree weather. now for the fit the paints are kind of form fitting but its a comfortable type of fit. the top is kinda loose fitting not to baggie just the right kinda of loose fitting for me
Date published: 2016-12-20
Rated 5 out of 5 by from Just what he was wanting Got this set of base layer for my boyfriend to keep warm working outside and they work great. He stays warm and they are fitted enough that he can wear it under his everyday clothes, plus the material is soft not scratchy like long underwear. He was so happy with them, we purchased a second set.
Date published: 2016-12-01
Rated 4 out of 5 by from Warm layer Bought to wear as part of multiple layers. Definitely felt warmer wearing it
Date published: 2016-11-20
Rated 5 out of 5 by from Omni Heat Shirt I purchased the shirt for my nephew. He works outside in cold. He refuses to work without it since he received it.
Date published: 2016-02-13
Rated 5 out of 5 by from Very warm I was impressed with the feel, look, fit and function. I've used under armour and Nike fitted baselayer shirts before, but this out performs them. It is a tight fit, but nowhere as tight as the others. Very comfortable and very warm. I usually have to wear a shirt and hoddie at home in the winters, but I wore just this shirt and I was fine! I will be purchasing several more. Wish I found this years ago.
Date published: 2016-01-18
Rated 5 out of 5 by from Not so cold out I wore this base shirt in -4 degree weather. It fit well and worked very good as a base layer under my heavier sweater. The quality is very good and the material does not itch or bind. Overall I am very pleased with this shirt.
Date published: 2015-12-31
Rated 5 out of 5 by from Warm Base Layer Like the jackets with Omni-Heat, you can wear fewer layers when you wear this base layer. They are very warm, yet, when you go inside or get in the car, you do not cook or sweat.
Date published: 2015-12-09
Rated 4 out of 5 by from Warmth Size and color were perfect. This base layer was medium warmth. I would not buy it again. It is not warm enough. I would get heavy warmth next time.
Date published: 2015-12-03
Rated 4 out of 5 by from Nice base layer-sleeves longer than normal Used it last weekend on a rainy and cold backpack trip. It worked well. This is a great base layer shirt. I am a classic medium and the torso fits well (not too snug), but the sleeves are about an inch too long. Would get 5 stars if it fit appropriately. Nice garment overall.
Date published: 2015-10-02
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Size & Fit Guide

Size Chart

Size & Fit Guide
Men's Body Measurement (Inches)
Neck 14-14.5 15-15.5 16-16.5 17-17.5 18-18.5 19-19.5
Sleeve Length 32 33 34 35 36 37
Chest 32-35 35-38 38-41 42-45 46-49 50-53
Waist 26-29 29-32 32-35 36-39 40-43 44-47
Hips 32-34 35-37 38-40 41-43 44-46 48-50
Neck 17-17.5 18-18.5 19-19.5
Sleeve Length 35 36 37
Chest 42-45 46-49 50-53
Waist 36-39 40-43 44-47
Hips 41-43 44-46 48-50
How to Measure
  • 1. Neck: Measure at the base or thickest part of your neck.
  • 2. Sleeves: Start at the center back of your neck and measure across the shoulder and down to the wrist. Round up to the next even number.
  • 3. Chest/Bust: Measure at the fullest part of the chest, under the armpits and over the shoulder blades, keeping the tape measure firm and level.
  • 4. Waist: Measure around the natural waistline, allowing the tape measure to sit comfortably.
  • 5. Hips: Measure around the fullest part of your hips.
  • 6. Inseam: Measure from the top of the interior leg to the bottom of the ankle.
Men's Fit Guide
Body contouring fit conforms to movement.
Body skimming fit with end-use mobility in mind.
Modern Classic / Regular
Universal, easy fit for comfortable range of motion.
Most generous fit for a full spectrum of movement.

How to Measure

Columbia Fit Guide

How to Measure

  • Fold up at dotted line.
  • Place against a wall or other 90 degree surface.

    Place heel against fold/wall on flat level surface.
  • Mark the end of the longest toe with a pen or pencil.
  • Measure both feet and use the larger measurement.
  • Read measurement and compare to size chart.
  • When comparing on the size chart, determine the closest larger measurement and use that number to determine your shoe size for your country’s shoe measurement standard.

Shipping & Returns

Shipping & Returns

Shipping Information

Shipping Method Rate Expected Delivery Time
Ground $6.00 3-7 Business Days
2-Day Air $12.00 2-3 Business Days
Overnight $19.00 1-2 Business Days
Free Standard Shipping

Return Policy

Returns are accepted within 60 days of the purchase date online or in-store. Your apparel must be in original and unworn condition, with tags still attached. Footwear returns must also include the original box.

Still Have Questions

See our Customer Service section for more details. Visit Customer Service

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