Technical lightweight insulating garment for FAST&LIGHT activities in cold conditions, standing out for its excellent weight-to-insulation ratio and high compressibility. With its innovative asymmetric zipper design, it prevents discomfort even during long hours of use. The short-sleeve design maximizes maneuverability and arm freedom. It features two chest pockets for easy access to gear. Its ¾ zipper reduces weight and facilitates harness use.
Its outer fabric offers excellent wind and rain resistance (PFC-Free), which combined with Sorona® bio-synthetic insulation panels (80 gr/m2 on the chest and back, 60 gr/m2 on the neck and arms), guarantee thermal protection and optimal breathability. Combine it with other W-Series garments (compatible zippers across different layers) and discover the lightest and most functional way to move in the mountains. Ideal as a second layer over the W-Series Merino Baselayer or as an insulating layer over the W-Series Stretch Pullover.
FAST&LIGHT - 233 g. (S)
Equipment
Short sleeves for improved mobility
Elastic chest pockets for gear storage
Ring in front pockets to secure gear
Asymmetrical front zipper YKK® ¾ compatible with harness
Double-slider zipper for easy interior access
Elastic panels under the armpits for complete freedom of movement
One-hand zipper pull for use with gloves
Side tanka adjustments at the hem for a perfect fit
Action Fit, pattern designed for high-intensity activities
Weight
Size S: 233 grams | Size M: 254 grams | Size L: 288 grams | Size XL: 302 grams
Fabric
Exterior fabric: 100% High Stretch Nylon 20 Denier 0.05 Ripstop, lightweight 40 g/m², windproof, DWR treatment free of PFCs.
Side fabric: 94% Polar Stretch Grid®, Polyester (94%) and Elastane (6%). Anti-pilling 4 (ISO 12945-2:2000). Mesh structure enhances interior ventilation.
Insulation: SORONA® bio-polymer, 37% Bio-Polyester and 73% Recycled Polyester. 80 g/m² on the chest and back, 60 g/m² on the arms for better mobility.
The Sorona® bio-synthetic insulation by DuPont provides excellent thermal insulation, is highly compressible, durable, quick-drying, and eco-friendly. It contains 37% renewable plant-based ingredients and is biodegradable under certain conditions. Sorona® fibers absorb very little water, maintaining thermal properties even in rainy or humid conditions.
Inner fabric: STORMFLEECE™ PRO
69% Recycled Polyester, 23% Polyester, 8% Spandex 4-way stretch.
Technology
STORMFLEECE™ PRO fabric uses patented technology from Singtex® to create a single-layer fabric (without membrane) made of almost 70% recycled products. It resists wind and rain while providing excellent thermal insulation, high breathability, and a very soft feel. This fabric leverages the strength and flexibility of fibers while significantly reducing material consumption. Its densely woven structure minimizes fiber and yarn waste, resulting in a fabric with a tough exterior and soft interior feel.
The OS2O FAST&LIGHT line powered by STORMFLEECE™ PRO allows for the development of lightweight, durable, technical single-layer products. Fabric developed under the BLUESIGN® System Partner program.
Size Guide
Size recommendation by Weight (kg) and Height (cm)
| kg / cm | 165 | 170 | 175 | 180 | 185 | 190 |
| 55 | S | - | - | - | - | - |
| 60 | S | S | M | - | - | - |
| 65 | S | S | M | M | - | - |
| 70 | S | S | M | L | L | - |
| 75 | - | M | M | L | L | XL |
| 80 | - | - | M | L | XL | XL |
| 85 | - | - | - | L | XL | XL |
| 90 | - | - | - | - | XL | XL |
