We’ll admit it we’re a little obsessed with the Fernos Knicker. Designed for skiers who demand warmth on cold lifts and breathability on uphill tours, this performance-driven midlayer hits the sweet spot between insulation and ventilation. With PeakFill™ Active Insulation for adaptive warmth and stretch side panels for unrestricted movement, it’s your go-to piece for long winter days on the mountain.

Performance Highlights

PeakFill™ Active Insulation: Balances lightweight warmth and breathability to keep your core temperature regulated through changing conditions.
Microfiber Fabric with Mechanical Stretch: Soft, flexible, and durable for smooth layering and all-day comfort.
Water-Repellent Finish: Resists moisture and speeds up drying time to maintain comfort in snowy or damp conditions.
Eco-Conscious Construction: Features 50% recycled polyester insulation for a smaller environmental footprint.

Key Features

Encased Elastic Waistband with Drawcord: Ensures a secure, adjustable fit.
Articulated Knees & Action Gusset: Designed for optimal mobility during high-output mountain activity.
Mid-Calf Length Cuff: Stops short of ski boots to eliminate bulk and bunching.
Zippered Thigh Pocket: YKK® zip secures essentials like a keycard, lip balm, or coffee cash.
Hanger Loop: Located on the center back waistband for easy drying and storage.

Fit & Measurements

Fit: Regular – not too tight, not too loose; perfect for layering under shells or over base layers.
Inseam: 22"
Weight: 9.9 oz.
Origin: Made in Vietnam

Material Composition

PeakFill™ Active Insulation: 50% Polyester / 50% Recycled Polyester, 40 g/m²
- Spiral filament structure enhances stretch, recovery, and quick-dry performance
- Provides durable warmth and moisture management in both calm and active conditions

Design Details

Heat transfer Stio® and Pinecone logos
Smooth interior heat transfer labels for next-to-skin comfort

Care Instructions

Machine wash cold, gentle cycle
Rinse well; do not bleach
Tumble dry low
Do not iron or dry clean

Why You’ll Love It

The Stio® Fernos Knicker delivers all-day comfort for skiers and mountain athletes who want warmth without the weight. With breathable insulation, mobility-focused design, and ski boot–friendly length, it’s the ultimate lower-body layer for high-output winter pursuits.

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