Mountain Hardwear  Crater Lake Long-Sleeve T-Shirt - Men's

I love these shirts so much I've got it in several colors - I feel like it's a hugely missed opportunity to not have a base later pant or perhaps lounge pants in this same fabric. This exact fabric blend is the real magic! I run hot but can wear this on a warm sunny day OR on a cool brisk day comfortably, can have the sleeves pulled back comfortably without it squeezing my forearms, or pulled down and in the thumb loops. I don't always keep the thumbs looped but it's super useful for when putting on a jacket over it! Imagine if some kind of base layer ankle loop on pants made out of this could be really cool for the same function, or just plain base layer. Please consider making a pant version!!!

I used this shirt for the first time on a 6 hour training hike. The wicking and quick drying abilities during 60-80 degrees and some wind were impressive. This is an extremely comfortable layer that I will look forward to using on Mt. Adams next month (July). I am 5’11” 180# and have a 34” waist, the Large is a great fit!

Very soft comfortable fabric. Quick drying. Fits true to size.

Most comfortable shirt I have for a wide range of weather.

This is the perfect light weight long sleeve shirt for every season. It is great quality, packs well, and a great long sleeve shirt for everyday wear, hiking, fishing, etc. It fits perfect and hasn't shown any sign of wear despite its use. I enjoy it so much that I purchased the same shirt in five colors! I hope Mountain Hardwear continues to make this shirt for a long time.

I have several of the Crater Lake hoodies as they are my go to Sun Protection while hiking/biking from sea level to alpine. Picked up the crew style so I don't have to embed a hood into my jacket hood when the temps drop. The crater lake series is simply a staple in my closet and it's generally the layer I grab first when headed out.

I have this in the hoody style and liked it so much I got the crew neck and SS shirts. Lightweight, cools me down, keeps me protected, wicks moisture and dries fast. Perfect for my summer technical hikes and for protection on the water without overheating.

I got this Crater Lake crew neck as a Christmas gift (2025) and I love the fit, the amount of stretch (88% nylon / 12% stretch is just about the perfect combo for lightweight stretchy tops, in my opinion.) And I hope Mountain Hardwear will continue to produce more colorful, interesting prints, because I get bored with the "safe" color options. The major negative that needs addressing is the roughness of the seams on the skin side of the garment vs. the softness of the seams on the face of the product. It feels like they should be opposite. The most uncomfortable seam is on the inside of the forearm, it rubs and creates sensitivity and discomfort to where I have to pull the sleeve up to relieve the discomfort after wearing the shirt for more than a few hours at a time. FIT: I am 6'2" 275lb and the XXL fits great. In fact, I wish your other crew neck baselayer shirt, the Butter Up, fit as nicely as this one. I have the Butter Up also and it feels just a bit too tight in the torso and mid section. So I'm glad this Crater Lake fits as great as it does.

What has happend to mountain hardwares quality? I bought this with a merchadise voucher, I recieved after I returned 2 other MH items. After one wash the seem has broke and hemming at the bottom of the shirt is no more.

Great material, super lightweight and comfortable. Fits well, although I went with a medium instead of a large for a tighter fit. nice colors, logo is a little big, but how else do you get your name out there.