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Mountain Hardwear
Crater Lake Half-Zip Top - Women's

4.625 out of 5 stars
16 Reviews
Current price: $52.49 Original price: $69.99
25% off
Color:Light Sun


Size Chart


Why We Like The Crater Lake Half-Zip Top

The Crater Lake Half-Zip Top keeps us protected from the sun's harsh rays when we're out hiking our local trails. Its half-zip design makes it easy to dump heat on uphill sections, and the lightweight design dries in a flash.


  • Long-sleeve performance shirt for hikes and everyday adventures
  • Thumbholes keep a secure fit under other layers as you move
  • UPF protection ensures your skin stays happy in the sunlight
  • Item #MHWZ9MF
88% polyester, 12% elastane
Center Back Length
[medium] 27in
UPF Rating
Claimed Weight
[medium] 5oz
Manufacturer Warranty

Overall Rating

4.5 based on 16 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 1 reviews
4 Stars - 1 reviews
5 Stars - 13 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

July 14, 2024

A Florida Must Have

I've put it through the wringer
Size Bought:

The crater lake line by MTN Hardwear is perfect for the summer months in Florida when you don’t want to lather on sunscreen all the time but still need to be protected from the sun. The material is so light, it honestly feels cooler wearing the shirt than a tank top. Love this line, the quarter zip is especially nice because it looks pretty sophisticated.

2 out of 5 stars

July 7, 2024

Not as good as I had hoped it would be

The fit and material are great but it was a mistake to order in white. It already looks dingy from one day wearing it hiking - I can’t get it clean looking


Originally reviewed on

5 out of 5 stars

June 19, 2024

Must have shirt for everyone

Absolutely love this product. I bought this for hiking as I've had skin cancer. It is so light weight that I am now also wearing it when riding my mountain bike in the summer. I want 10 more! Please just make more colors. I also love the thumb hole as it keeps the sun off my hands when hiking.

user image

Originally reviewed on

5 out of 5 stars

February 14, 2024

Beautiful shirt

Love the fit, color, lightweight, sun protective features, very stylish and comfortable


Originally reviewed on

3 out of 5 stars

January 18, 2024

Light Shirt With Warm Collar

Lightweight fabric provides sun protection in hot weather. The higher neckline is good for further sun protection. The only complaint is that the fabric on the higher collar is doubled up (two layers of fabric) so my neck gets too hot. If the collar were just a single layer of the nice light fabric, it would be much more functional. Why put a thick collar on an otherwise very lightweight hot-weather shirt?


Originally reviewed on

5 out of 5 stars

December 27, 2023

Lightweight and soft!

I was very happy with the Crater Lake1/4 zip! I am not a runner nor athlete (anymore) but was looking for something as an everyday lightweight zip-up to wear under vests mainly or when I don't want to wear something bulky under my winter coats. This was perfect. I felt it was "sort of" true to size, more generous if anything (it's not a tight stretch). I bought the Medium: I'm 5'4, 135 lbs, 36C bust. It's not tight at all, falls just nice. I can wear a long sleeve crew neck tee shirt underneath and it still falls well, not tight. But if you're a runner and want something more form fitted, I'd size down. This was a quality piece and I'm getting another one. Just thrilled. (I bought the light grey/soft camo one, and it looks exactly like the pictures).


Originally reviewed on

5 out of 5 stars

August 18, 2023

Perfect for the Arizona summer! Nice shirt!

Lightweight, and works as a cooling shirt when I pour water down my back. I like how it is NOT super fitted... just a little bit loose so it's more comfortable, and more complimentary to a "mature" figure. Have worn (and washed) it around six times so far and it's holding up great.


Originally reviewed on

5 out of 5 stars

July 26, 2023

Perfect for desert conditions!

Very nice sun shirt!! I use it when I ride my horse and it's perfect for the intense SW desert heat and sun. I like it because it's lighter weight than the sun shirts that are made specifically for equestrians... much more comfortable here. Stitching seems to be good although I've only worn (and washed) it a few times.


Originally reviewed on

5 out of 5 stars

May 26, 2023

The best YET.

The best SPF top yet. I use it for road cycling under a fluorescent vest.The sleeves have a thumb hole so that the backs of my hands are protected under my cycling gloves. The material feels soft and cool on my skin.

Outdoorsy and ageless

Originally reviewed on

5 out of 5 stars

March 12, 2023

Perfect light long sleeve shirt

Super comfortable, light weight and awesome to touch


Originally reviewed on