Skip to product information
Woman wearing a black long-sleeve princess cut 100 percent merino wool base layer top on a white background
  • Woman wearing a black long-sleeve princess cut 100 percent merino wool base layer top on a white background
  • smiling woman wearing a red beanie and white 100 percent merino wool base layer top in the sun with snow and trees
  • Woman in gray 100 percent merino wool base layer top with black side panels in a snowy landscape with trees.
  • Woman wearing a gray 100 percent merino base layer top on a white background - side view
  • Woman wearing a gray long-sleeve 100 percent merino base layer top on a white background - view from behind
  • Woman wearing a radian violet 100 percent merino wool base layer top standing outdoors on a balcony with trees in the background
  • Two smilin women with backpacks in a snowy forest wear 100 percent merino wool base layer tops in blue and gray
  • Woman in winter gear smiling in a snowy forest wearing a gray 100 percent merino wool base layer top
  • Woman wearing a black long-sleeve princess cut 100 percent merino wool base layer top on a white background
  • smiling woman wearing a red beanie and white 100 percent merino wool base layer top in the sun with snow and trees
  • Woman in gray 100 percent merino wool base layer top with black side panels in a snowy landscape with trees.
  • Woman wearing a gray 100 percent merino base layer top on a white background - side view
  • Woman wearing a gray long-sleeve 100 percent merino base layer top on a white background - view from behind
  • Woman wearing a radian violet 100 percent merino wool base layer top standing outdoors on a balcony with trees in the background
  • Two smilin women with backpacks in a snowy forest wear 100 percent merino wool base layer tops in blue and gray
  • Woman in winter gear smiling in a snowy forest wearing a gray 100 percent merino wool base layer top
100% Merino Wool Base Layer - Women's Midweight Thermal Top

100% Merino Wool Base Layer - Women's Midweight Thermal Top

$89.99
Color
Size

This well-fitted princess-cut crew Merino base layer provides cozy warmth and spectacular comfort. Built for when the cold settles in and synthetic layers fall short.

Description

The Minus33 Ossipee Women’s Midweight Wool Crew is a 100% Merino Wool base layer that delivers natural warmth, breathability, and shaped comfort for everyday wear and demanding cold-weather conditions. Wear it as a soft, next-to-skin base layer or standalone mid-layer.

Materials

  • Fiber Content: 100% Merino Wool
  • Fabric Weight: 245 GSM Midweight
  • Knit Type: Interlock Knit
  • Fiber Fineness: 18.5 Micron Fibers
  • Sun Protection: UPF 50+
  • Certifications: OEKO-TEX® Standard 100, Woolmark®, Responsible Wool Standard® (RWS)
  • Care Rating: Total Easy Care (Machine Wash & Dry)

Construction & Fit

  • Total Garment Weight: 8 oz / 227g (Size Medium)
  • Fit Type: Regular fit — standard cut with room to breathe, tailored princess silhouette (Runs true to size)
  • Layering: Base Layer or Mid Layer
  • Neckline: Crew Neck
  • Stitching: Flatlock seams to prevent chafing; Princess seams for a shaped fit
  • Label: Tagless design (no itchy neck tags)

Origin & Sourcing

  • Wool Source: 100% Australian Merino Wool
  • Manufacturing: Imported
  • Ethical Standards: Responsible Wool Standard (RWS) certified animal welfare and land management

Recommended Uses

  • Ideal Seasons: Spring, Fall, Winter
  • Activities: Everyday Wear, Hiking, Camping, Biking, Running, Fishing, Hunting, Snowsports
  • Temperature Range: 0°F to 30°F (Active) | 30°F to 60°F (Inactive)

Size Guide

Measurements refer to body size, not garment dimensions. All measurements are in inches.

Size USA Size Chest Waist Hip Shirt Length Inseam
XS 2 32–33" 24–25" 34–35" 23.5–24.5" 26–29"
S 4 to 6 34–35" 26–27" 36–37" 24.5–25.5" 28–30"
M 8 to 10 36–38" 28–30" 38–40" 25.5–26.5" 29–31"
L 12 to 14 39–41" 31–33" 40–42" 26.5–27.5" 30–32"
XL 16 to 18 42–43" 33–35" 43–44" 27.5–28.5" 30–32"
Care Guide: Turn inside out before washing. Machine wash cold on a gentle cycle with like colors using mild or wool-specific detergent. Tumble dry low heat. Do NOT use fabric softener or bleach. For seasonal storage, place in an airtight container.

About Minus33

Rooted in over a century of New Hampshire woolen heritage, Minus33 designs performance-driven Merino wool apparel built for the elements. Born and tested in the rugged White Mountains, the brand focuses on natural fiber performance, thermal comfort, and durable construction for demanding outdoor pursuits.

Product Story

Ossipee [aw-sip-pee]: The Ossipee Mountains are nestled just south of the White Mountains, with Mount Shaw (2,999 feet) as their highest peak. Formed by an ancient volcanic event, they now offer sweeping views across New Hampshire’s Lakes Region.

Why No Polyester

Your Ossipee Crew is crafted from 100% natural Merino wool and contains zero synthetic poly blends. Here's why that matters to your health.
Shipping & Returns Policy

Free Shipping: Shipping is free on all orders.

Return Policy: ShirtCastle Originals: Because each ShirtCastle Original is made to order, we're unable to accept returns or exchanges. Please review product details carefully before ordering.

For partner-brand products, contact us at aaron@shirtcastle.com to request a return.

Damages & Defects: In the rare event of a manufacturing error, we will replace your item for free—you do not need to ship the original back. To report an issue, email aaron@shirtcastle.com within 30 days of delivery and attach a clear photo of the defect. We will reply via email and process your replacement.

You may also like