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SmartWool PhD Knit Arm Warmer

Out of Stock

Item # SWL0861

Don't worry though, we have a lot more Running Arm Warmers in stock than that.

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Item # SWL0861


Tech Specs

61% merino wool, 36% nylon, 3% elastane
Cuff Closure:
Recommended Use:
Manufacturer Warranty:

Size chart


Arm & Knee Warmers
Knee Warmer
Length 16in
Lower Thigh
16 - 17in
(40.6 - 43.2cm)
17.5 - 18.5in
(44.5 - 47cm)
Lower Calf
13 - 14in
(33 - 35.6cm)
14.5 - 15.5in
(36.8 - 39.4cm)
Arm Warmer
(wrist to top of bicep)
16 - 18in
(40.6 - 45.7cm)
18 - 20in
(45.7 - 50.8cm)
6 - 6.5in
(15.2 - 16.5cm)
7 - 7.5in
(17.8 - 19.1cm)
Upper Arm
11 - 12in
(27.9 - 30.5cm)
12.5 - 13.5in
(31.8 - 34.3cm)

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SmartWool PhD Knit Arm Warmer

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Here's what others have to say...

2 5

Too tight!

  • Familiarity: I returned this product before using it
  • Fit: Runs small

According to the sizing guide these should have fit me, but they were so tight that they cut off circulation when I bent my elbows. There's no way I could use them.

2 5


  • Familiarity: I gave it as a gift but have feedback to share
  • Fit: True to size

Gifted to a friend. She says they look great, but they are so itchy she can't wear them. Will be returning.

4 5

Good Product, not for Biking

these arm warmers work great for most aerobic activity. the merino wool feels awesome and does a great job or providing warmth while wicking moisture. they don't provide as much wind protection as other materials though. they also don't have any water resistance, though they do dry quickly.

great for running/hiking, go with something else for biking.

4 5


lightweight, yet very warm for my early morning bike rides - as my arms are always the coldest part of my body at 6am. fit snug but not constricting.