Merino Wool Isostatic Performance T-Neck Top

The Merino Wool Isostatic T-Neck Top is the perfect blend of sophisticated style and high-performance function. With its silky-soft merino wool, cozy tall neck, and cuffed sleeves, this base layer is built to keep warmth in and cold out—whether you’re layering up for a winter adventure or lounging in comfort. Designed to fit smoothly under other layers, it’s versatile enough for outdoor action and everyday wear.

• Odor-resistant Merino wool for all-day freshness

• Tall neck and cuffed sleeves for extra warmth and coverage

• Minimal, thoughtfully placed seams for a flattering, chafe-free fit

• Two fit options to suit different body shapes

• Great for skiing, winter biking, sledding, and après activities

• Proudly made in the USA of imported fabric

Fabric

Made from ultra-soft 18.5-micron Merino wool, this 150gsm fabric is lightweight, breathable, and naturally odor-resistant, keeping you comfortable through any adventure. Certified to the Responsible Wool Standard, this wool is sourced from farms committed to sustainable land management, ethical animal welfare, and fair working conditions.

• 87% Responsible Wool Standard Merino Wool

• 13% Recycled Nylon

Because adventure-ready durability matters, we’ve reinforced this luxurious Merino wool with 13% recycled nylon—enhancing strength without compromising softness. That means you get the best of both worlds: the performance of Merino with added durability for the long haul.

Fit

This top is designed to cascade over the body, offering a smooth, non-clingy fit that layers effortlessly under other gear.

Choose from two fit options:

• Wild Iris Fit – Ideal for straighter body shapes or those who prefer a more classic cut.

• Azalea Fit – Designed for curvier figures, with more room in the bust or hips and a gently tapered waist.

Not sure which fit is best? We recommend Wild Iris Fit as a starting point, based on customer favorites. And with free returns and exchanges, you can find your perfect match with confidence!

Specs

• Weight: 5 oz (Size M)

• Made in the USA of imported fabric

Suggested pairing 

Pair it with our Katabatic Merino Wool Base Layer Bottoms for ultimate coziness, whether you're hitting the slopes or warming up by the fire. Wherever winter takes you, this top is ready to keep up!