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DeFeetWoolie Boolie 4in Socks

Item # DFT000M

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Item # DFT000M

Matty told Hattie about a sock she saw.

Whether you're dancing on your pedals, or to the '60s rock song bearing a similar-sounding name, DeFeet's Woolie Boolie 4-inch Socks were designed to keep your feet warm, dry, and comfortable.

As the name implies, DeFeet's Woolie Boolies were constructed using a blend of ultra-fine New Zealand Merino wool, as well as Lycra and nylon. The Merino wool in the makeup helps the socks breathe, wick moisture, and resist the build-up of odors, while also providing medium-weight insulation for cool-weather conditions.

The Aireator mesh fabric on the forefoot and instep works to dump excess heat through its ultra-breathable makeup, and the overall thickness of the socks' composition remains consistent throughout. This is something that sets the Woolie Boolies apart from many other Merino-blended socks. In other words, there are no padded heels, toes, thin insteps, or other variances to cause friction or abrasion inside your shoes. Along these lines, deep heel pockets and smooth toe seams further prevent chafing. Rounding out the Woolie Boolies are four-inch cuffs that provide a smooth wrap and ample coverage around your ankles and lower legs.

Tech SpecsSize
Tech Specs
72% merino wool, 15% Lycra, 8% nylon, 5% elastane
4 in below calf
Recommended Use
cool and cold weather cycling
Manufacturer Warranty
1 year


Socks & Accessories
US MEN Shoe Size 4.5 - 6.5 7 - 9 9.5 - 11.5 12 - 14
US WOMEN Shoe Size 6 - 8 8.5 - 10.5 11 - 13  
EU Shoe Size 36 - 39.5 40 - 42.5 43 - 45.5 46 - 48
Palm Circumference

6 - 7in

(15.5 - 18cm)

7 - 8in

(18 - 20cm)

8 - 9in

(20 - 22.5cm)

9 - 10in

(22.5 - 25cm)

10 - 11in

(25 - 27.5cm)

 S / MM / L
Wrist to Top of Bicep

15 - 18in

(38 - 45.5cm)

18.5 - 21.5in

(47 - 54.5cm)


< 5ft 9in

(< 175cm)

> 5ft 9in

(> 175cm)


< 160lb

< 72.5kg

> 160lb

> 72.5kg

 S / MM / L

under 5ft 10in

(under 178cm)

over 5ft 10in

(over 178cm)

Measure around your hand at the widest point excluding the thumb.

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Defeet Blaze

  • Familiarity: I've put it through the wringer
  • Fit: True to size
  • Size Bought: xl

These socks can be worn year round. Warm in the winter and cool in the summer. Sounds crazy, but I have been doing it for years. The light colored ones I bought, I will probably wear for casual, because they are so comfortable.

Great winter socks

  • Familiarity: I've put it through the wringer
  • Fit: True to size

This is my third pair of these socks. The pair that these were bought to replace lasted about seven winters. They are the warmest socks I know of and will keep you warm down to the mid-twenties with a suitable bootie. They will make your feet sweat if the temps rise too quickly. Great product. I wear a Sidi 47 and extra large is a perfect fit.