What head size is the "One Size" Minus33 Merino Wool Ridge Cuff Beanie

It means it's for "average" sized domes. The respondents claiming it will comfortably fit all head sizes are likely the same 5'10 guys claiming to be 6'1". I don't wear hats, thus cannot relate to hat size. I however wear a size 62 motorcycle helmet. This is determined by measuring perimeter of dome from just above (15mm) eyebrows. I am 61.8 cm. As delivered new, this beanie is very snug and barely covers down to mid ear. I soaked mine in cold water for 5 minutes then stretched and tugged over my head. Finally, let it air dry at room temp fitted over 1 gal paint can to 'block it', preventing shrinkage. This worked for me such that it doesn't pull down as low as i'd prefer but its no longer so tight to give me a headache.

How many % merino wool?

100% Australian Merino Wool - Lightweight - 18.5 micron - 230/m - helps regulate body temperature Imported. I brought with me two other beanies on my trip to Iceland. Out of the 3 I used this more as it kept me warm (in below zero temperature with wind chill)

Is this hat thin enough to wear under a bike helmet?

Hello, This hat can be worn under a helmet. It is approx. 3mm in thickness, yet still very warm. Let us know if you have any other questions! - Minus33 Merino Wool Clothing

Is it good choice to wear under -20 degree Celsius?

Merino Wool is very warm while also being very lightweight. I have worn mine at -4 F, which is -20 C, and been very comfortable.

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100% Merino Wool Cuff Beanie - Mens & Womens Warm Winter Hat - Watch Cap - Toque - Novelty Beanie - One Size Fits Most

100% Merino Wool Cuff Beanie - Mens & Womens Warm Winter Hat - Watch Cap - Toque - Novelty Beanie - One Size Fits Most

Product ID: 75454604

🧶100% Merino Wool - ultra soft & natural warmth

⚖️Lightweight 2.4 oz (68g) - packable & easy to carry

🛡️UPF 50+ protection - shields from harmful UV rays

Description

🧢 Stay warm, look sharp, and never miss out on the outdoor vibe!

EFFORTLESS CARE - Machine washable & dryable—premium Merino wool that fits your busy, on-the-go routine.
ALL SEASON VERSATILITY - Perfect for winter runs, hikes, skiing, or casual city strolls—comfort that adapts to your lifestyle.
TRUSTED HERITAGE BRAND - Minus33, a legacy of quality since 2004, blending century-old wool expertise with modern performance.
NEXT LEVEL COMFORT WARMTH - Double-layer interlock knit with 18.5 micron wool delivers cozy insulation without bulk.
HELMET FRIENDLY MOISTURE WICKING - Slim, packable design fits under helmets and keeps you dry by wicking sweat during intense activity.

This 100% Merino Wool cuff beanie combines lightweight, breathable warmth with UPF 50+ sun protection in a sleek, double-knit design. Engineered for active lifestyles, it fits comfortably under helmets and wicks moisture to keep you dry. Machine washable and crafted by Minus33, a trusted brand with over a century of wool expertise, this one-size-fits-most toque is your essential winter companion for any outdoor adventure.

Specifications

ASIN	B00B2A4RBK
ASIN	B0B57JN274
Age Range Description	Adult
Apparel Fabric Stretch	Medium Stretch
Apparel Fabric Weight Class	Lightweight
Best Sellers Rank	394,053 in Fashion ( See Top 100 in Fashion ) 6,939 in Men's Hats & Caps
Brand Name	Minus33 Merino Wool
Closure Type	Pull-On
Colour	Charcoal Gray
Customer Reviews	4.6 4.6 out of 5 stars (5,381)
Customer reviews	4.6 4.6 out of 5 stars (5,381)
Date First Available	3 Oct. 2013
Department	Unisex
Fabric Type	100% Wool
Fit Type	Stretch
Fit to Size Sentiment	positive
Global Trade Identification Number	00879955006531
Hat Form Type	Beanie
Import Designation	Imported
Is Waterproof	false
Item Dimensions	23.6 x 21.3 x 2 centimetres
Item model number	3580
Manufacturer	Minus33 Merino Wool Clothing
Manufacturer	Minus33 Merino Wool
Manufacturer Part Number	3580CG
Material Type	Wool
Model Number	3580
Number of Items	1
Occasion Type	summer
Package Dimensions	2.54 x 2.54 x 2.54 cm; 453.59 g
Pattern	Solid
Pattern Description	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Outdoor Wear
Season and Collection Year	dawp
Seasons	Winter
Special Features	Ear Warmer, Moisture Wicking
Sport Type	Camping & Hiking
Style Name	Classic
Sun Protection	5E+1 Sun Protection Factor (SPF)
Theme	Casual
UPC	879955006531
Ultraviolet Protection Factor	UPF 50+
Unit Count	1.0 count
Water Resistance Level	Not Water Resistant

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