Rab Modulus Pull On

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Light, stretchy, and breathable—this is a midlayer made for the demands of high-energy alpine adventures.

Rab says: 

With a streamlined fit that allows unrestricted mobility, this warm, hardwearing pull-on is an essential layer for alpine ascents and winter climbing. Made with fast-drying, durable Thermic™ Stretch Pro fleece, it’s comfortable and soft next to skin.

Our Verdict

From my experience, the Modulus Pull-On strikes a great balance between warmth and breathability. The Thermic Stretch Pro fleece feels soft against the skin, while its excellent stretch and slim fit allow unrestricted movement. It works well as an active layer, fitting snugly under a shell without adding bulk. The deep front zip is a welcome feature, offering quick ventilation during high-intensity efforts, and the thumb loops ensure the sleeves stay in place, adding a touch of extra warmth to your hands.

The left arm pocket is small but handy for storing essentials like a snack or a map. At 363g (size M), it’s impressively light for its performance, though it leans more towards active use than providing maximum insulation for rest stops.

The Modulus Pull-On is a solid choice for those seeking a versatile and durable fleece that prioritises movement and functionality.

– Reviewed by Ultralight Outdoor Gear

Features

• New addition to the Thermic™ family, this fleece is durable, quick wicking with great stretch and recovery
• Thumb loops at cuff help to prevent bunching and provide extra palm protection
• YKK® VISLON® deep venting centre front zip with zip guard
• Matrix™ stretch woven left arm pocket with YKK® zip
• Set in sleeve construction with underarm panel provides greater freedom of movement

Specifications

• Small weighs: 344g
• Medium weighs: 363g
• Large weighs: 393g
• XLarge weighs: 395g
• Fit: Slim
• Centre back length (Size M): 72cm / 28.3inch

Material & Construction

• Main: 56% polyester (recycled) 37% polyamide 7% elastane
• Pocket: 85% polyamide 15% elastane
• Pocket Bag: 100% recycled polyester

Help & advice:

• Thermic™ Stretch Pro Fabric Explained
• Recycled Content in Outdoor Gear