Minus33 Microweight Merino Boyshorts (Women's) Review (2026)

What it is

The Minus33 Microweight Merino Boyshorts, sold under the brand's Woolverino line, are a lightweight merino wool underwear option built specifically for warm-weather and high-output use rather than cold-weather insulation. According to Minus33's own product page, the fabric is a microweight jersey knit at roughly 145 grams per square meter, the lightest weight in the brand's merino lineup, chosen to stay breathable in hot conditions where a heavier merino garment would feel too warm. Minus33 has produced merino wool clothing since 2004, positioning this as a budget-friendly alternative to premium merino underwear brands for travelers who rewash garments in a sink.

Features and specs

Minus33 lists the fabric composition as 84 percent merino wool, 12 percent nylon, and 4 percent spandex, using 17.5 micron merino fibers, a fineness generally associated with softer, less itchy wool against the skin. The boyshort cut offers generous rear coverage designed to prevent chafing during long walking or hiking days, a common complaint with briefs on multi-hour travel days. A 1-inch woven sport elastic waistband paired with flatlock seams is built to reduce rubbing and keep the garment in place during movement. The fabric also carries a UPF 20 rating for basic sun protection, and Minus33 states the garment is Woolmark certified and OEKO-TEX Standard 100 certified for textile safety.

Build and materials

The 12 percent nylon and 4 percent spandex blended into the merino wool is meant to add stretch and durability that pure wool underwear lacks, since 100 percent merino garments tend to wear thin faster under repeated stretching. Minus33 lists the boyshorts as machine washable and dryable, simpler care than merino garments that require hand washing or line drying only. Because this is the lightest microweight fabric in Minus33's lineup, it will likely show wear sooner than the brand's midweight or heavyweight merino products under frequent daily washing, a tradeoff for the added breathability the thinner knit provides in hot climates.

Value

Minus33 positions itself as a lower-cost alternative to premium merino brands like Icebreaker or Smartwool, and the boyshorts reflect that with a composition and construction similar to pricier competitors at a lower price point. For travelers comparing this against Icebreaker's Merino Sprite Hot Pants, the main differences are Minus33's slightly heavier microweight fabric at 145 grams per square meter versus Icebreaker's lighter 150 ultralight weight fabric, and the price gap between the two brands. Buyers get most of the odor resistance and comfort benefits merino is known for without paying premium brand pricing, though the thinner microweight fabric may not last as many wash cycles as a heavier merino weight.

Who should buy it

These boyshorts suit budget-conscious travelers who want merino wool's odor resistance and moisture management for warm-weather trips without paying premium brand prices. The boyshort cut and flatlock seams make them a solid choice for long walking or hiking days where briefs might chafe. Travelers heading to consistently hot, humid climates will likely appreciate the microweight fabric's breathability more than those needing cold-weather insulation, since this is the lightest option in Minus33's lineup rather than a versatile all-season piece. Anyone planning very frequent machine washing over a long trip should know the thin fabric may wear faster than a heavier merino weight.

Frequently asked questions