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Woolpower Helmet Cap 400

photo: Woolpower Helmet Cap 400 winter hat


Price Reviewers Paid: $25.00


1 review
5-star:   1
4-star:   0
3-star:   0
2-star:   0
1-star:   0

This hat is good for any activity requiring full peripheral vision in temperatures ranging from 5 to -15 degrees Celcius. Ideal for any activity where lightweight warmth is needed under a helmet—ice climbing, biking, horse back riding, etc..


  • Warmth/ weight ratio
  • Ear and neck coverage
  • No obstructed vision


  • Might be too small for larger heads

The Woolpower Helmet Cap is made from their 400 weight wool. Woolpower has added terry loops on the interior of their products which they call Ullfrotte. This adds in the warmth as it helps traps air, and thus maximize insulation.

To start a couple points about the ethics of the company...

1) All wool is harvested in South America where is can be guaranteed that all wool was ethically sourced.  There is an interesting read on the company's website here.... 

2) Batches that don't meet company standards are donated to charity.

3) The seamstress who sews your garment adds his/her name on the inside tag.


Now on to my review of this hat....

Limitations- I wear a size 7 baseball cap, approx 22 inch circumference, and I love the fit of this hat. It does stretch but I can't imagine it would be an ideal fit if you had a larger sized cranium. There is no way to tighten or loosen the fit. This is not a balaclava so there is no nose, mouth, front of neck protection.

Summary- Having short hair I need to almost constantly have something on my head to regulate my temperature. Wool is the perfect fabric to do this. I find myself reaching for this hat, more than any other, and I have many! I have used this for 2 years now in all kinds of temps. It works well on its own to about -15c, and layers nicely under a heavier layer for colder temps.

Source: bought it new
Price Paid: $25

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