MTF4000 Base Layers

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Hot Chillys ranks products based on Hot Chillys warmth thermometer. Six is the least warm with a green color background, yellow is the next warmest, then light orange, dark orange, and ten is the most warm with a red color background. This product is a light orange seven on the Hot Chillys warm thermometer.

A fan favorite is back!

Engineered for cold-weather performance, the Hot Chillys MTF4000 collection delivers midweight base layers designed to keep you warm, dry, and comfortable during every adventure. Featuring our proprietary Moisture Transfer Fibers (MTF), these garments wick sweat away from the skin, while odor-blocking technology helps you stay fresh even during long days on the slopes or trails.

With 4-way stretch fabric, UPF 30 sun protection, and a soft, flexible polyester-spandex blend, the MTF4000 line offers a perfect balance of warmth, mobility, and durability. Our crew neck tops and ankle-length layers in this collection are ideal for layering or wearing on its own—whether skiing, hiking, cycling, or exploring in cooler climates.

Stay warm. Stay dry. Stay active.

    Warmth factor 7 out of 10 - Relaxed fit stretch fabric for warmth in cold conditions.

    A fan favorite is back!

    Engineered for cold-weather performance, the Hot Chillys MTF4000 collection delivers midweight base layers designed to keep you warm, dry, and comfortable during every adventure. Featuring our proprietary Moisture Transfer Fibers (MTF), these garments wick sweat away from the skin, while odor-blocking technology helps you stay fresh even during long days on the slopes or trails.

    With 4-way stretch fabric, UPF 30 sun protection, and a soft, flexible polyester-spandex blend, the MTF4000 line offers a perfect balance of warmth, mobility, and durability. Our crew neck tops and ankle-length layers in this collection are ideal for layering or wearing on its own—whether skiing, hiking, cycling, or exploring in cooler climates.

    Stay warm. Stay dry. Stay active.

      Hot Chillys ranks products based on Hot Chillys warmth thermometer. Six is the least warm with a green color background, yellow is the next warmest, then light orange, dark orange, and ten is the most warm with a red color background. This product is a light orange seven on the Hot Chillys warm thermometer.
      Warmth factor 7 out of 10 - Relaxed fit stretch fabric for warmth in cold conditions.

      MTF4000 Technical Features

      Four-way Stretch

      Designed to follow the natural curves of your body, they provide warmth without bulk, reduce fabric bunching under outer layers, and ensure optimal moisture transfer.

      Moisture Transfer Fibers

      Keeps you dry, warm and comfortable with our exclusive MTF technology enabled by hydrophobic yarns that move moisture away from your body

      UPF 30

      A UPF 30 rating is designed to block approximately 97% of UVB rays