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Men’s Midweight Stretch Baselayer Tight


https://www.columbia.com/mens-midweight-stretch-baselayer-tight-1638601.html 1638601
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Style# 1638601
Uses Winter


Finely crafted for dynamic activity in the cold, this versatile midweight tight excels in a wide variety of conditions and situations, featuring a wicking gusset and waistband to keep you comfortable and dry, stretch properties for mobility, and thermal reflectivity for lightweight warmth.

  • Omni-Heat™ thermal reflective
  • Omni-Wick™
  • 4-way comfort stretch
  • Antimicrobial treatment protects this product from bacterial growth
  • Ergonomic seaming
  • Flatlocked construction
  • Gusset detail
  • Imported
  • Uses: Winter
  • Style# 1638601

  • 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 Tight is rated 4.6 out of 5 by 14.
Rated 4 out of 5 by from Really good product with one caveat I really like the product, very comfortable, great as a base layer, warm without being oppressive. My only knock is I wish it was a bit more form fitting, I thought it would fit like under armor, it's not that tight, which may be good or bad depending on your usage. I'm 5'11 165lbs and got a Medium, the waist fits perfect.
Date published: 2017-11-13
Rated 5 out of 5 by from Thermal Tights Love the quality and kept me very warm. I recommend this to any hikes in the fall or up the mountains just because it also gave more stability for my knee. I hope to buy more in the future as I expand my hiking ventures.
Date published: 2017-10-21
Rated 5 out of 5 by from This product was perfect for what I needed it for I bought this product for my recent trip to Iceland. I wore them u set my jeans as thermals and they worked perfect for this trip. They kept me warm and were very comfortable.
Date published: 2017-10-20
Rated 5 out of 5 by from Core warmth Fishing in Northern New England and Northern Quebec requires a quality base layer. These provide this with little weight, durability and functionality. Whether under waders while fly fishing cold water, in my Kayak, or snow shoeing no issue with keeping warm. Plus light weight which is important when flying into remote wilderness camp sights to fish.
Date published: 2017-04-26
Rated 4 out of 5 by from Very long! This under layer pant is very long in the legs, otherwise it's a nice fit. Again, wouldn't recommend unless you are tall or have long legs.
Date published: 2017-03-07
Rated 5 out of 5 by from Excellent fit and function! Bought these to wear under some slacks while staying up in Mammoth Lakes, CA for a snowboarding weekend. I will say that in cold conditions, the Omni-heat does what is promised and keeps you warm. When in warmer conditions, it doesn't make you sweat. Very impressed with the technology and will grab another pair for my upcoming trip to Scotland and Ireland in a few months! BTW, I'm a 6'4", 300+ lbs guy and the XXL size fit perfectly for me.
Date published: 2017-02-09
Rated 5 out of 5 by from great baselayer i bought this at a sport store not from here its the same product. i have worn this in 18-28 degree weather with just blue jeans on and this. i keep warm. Now i will say this if you are standing still not moving you will start to fill the cold creep in. as long you are active moving around in my use i keep warm as for fit they fit just fine for me not to tight ...not to lose.. they did not bunch up or anything. i recommend them highly
Date published: 2016-12-22
Rated 3 out of 5 by from Unique thermal blanket liner The base clothing with the thermal lining is functional in the more extreme skiing I participate in. I like it.
Date published: 2016-12-17
Rated 5 out of 5 by from very nice I like this bottom a lot! Interesting silver on the inside. Does a good job of keeping sweat away. My main running bottom right now:)
Date published: 2016-07-10
Rated 4 out of 5 by from Necessity These are by far the best thermal bottoms I have ever had. They are comfortable and very functional. When I wear these I feel like I almost couldn't get cold yet can move around a lot and not sweat too much. The only reason that I gave the 4 stars is that I feel like they are a tiny bit on the pricy side. Certainly worth the money but doesn't make if feasible to have multiple pairs.
Date published: 2016-02-25
Rated 5 out of 5 by from stretch base layer awesome very warm and comfortable
Date published: 2016-01-02
Rated 5 out of 5 by from Excellent Tight Wore this skiing in about 15-20 degrees - legs were perfectly warm. Fits tight (not in a bad way) - no room for another layer underneath. Great tight!
Date published: 2015-12-15
Rated 5 out of 5 by from Warm Base Layer These fit great and are warm, while providing some breathability. True to size, but I had to order a medium bottom to go with the large top that I ordered.
Date published: 2015-12-09
Rated 5 out of 5 by from Great for Motorcyclists! We motorcyclists buy a lot of very expensive gear to enable ourselves to ride year round. Well, the Columbia baselayer gear eliminates that nonsense. Some guys ride around looking like the Michelin Man or wearing their summer gear but freezing. This stuff is the answer. Now I'm sure other people have known this for years but this is my first time wearing baselayers. When I start out in the morning and it's 45 degrees out but later the temp rises to 85 degrees, I'm not that uncomfortable. That's hard to quantify and very hard to put a price on. Good stuff.
Date published: 2015-11-21
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Size & Fit Guide

Size Chart

Size & Fit Guide
Men's Body Measurement (Inches)
Pant Size 28-30 32 34 36 40 44
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
Inseam Varies by Item
Pant Size 36 40 44
Waist 36-39 40-43 44-47
Hips 41-43 44-46 48-50
Inseam Varies by Item
How to Measure
Mens size chart measurement guide
  • 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.
mens performance fit bottom
Body skimming fit with end-use mobility in mind.
mens active fit bottom
Modern Classic / Regular
Universal, easy fit for comfortable range of motion.
mens modern classic fit bottom
Most generous fit for a full spectrum of movement.
mens relaxed fit bottom

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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