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A base layer shirt is the foundation of any outdoor layering system. Choosing a breathable t-shirt instead of a material such as cotton means that the shirt can manage your body's moisture and perspiration more efficiently and keep you comfortable on your hike.

The range of Rab® men's base layer tops will help to keep you cool on warm days and will dry quickly when wet. Combine your breathable t-shirt with an insulating midlayer such as a fleece jacket under your waterproof during winter to ensure your body warmth stays where it needs to be. The theory behind the outdoor layering system is that it is much easier to layer up or remove layers to manage your body temperature than it is to cool down or warm up by simply using thicker or thinner items of clothing. When your layers are working in harmony together, it makes for a much more comfortable expedition. Combine your baselayer shirt with a pair of base layer pants to create a complete insulating base layer set for additional warmth.

Related: All Base Layers

Color

11 Items

per page
  1. Flux Pull On
    New Arrival

    Flux Pull On

    $85.00

    Practical both as a midweight baselayer and a lightweight fleece, our easy-pack Flux Pull-On is perfect for longer multi-day climbing and trekking trips... when you want to stay warm, dry and active.

  2. Beluga
    Great for Hillwalking

    Merino Blend

    Forge LS Tee

    $60.00

    The Forge Long Sleeve Tee is a lightweight merino blend baselayer optimised for wicking, warmth and temperature regulation.

  3. Ink
    Merino Blend

    Forge SS Tee

    $50.00

    The Forge Short Sleeve Tee is a lightweight merino blend baselayer optimised for wicking, warmth and temperature regulation.

  4. Ebony

    Pulse LS Zip

    $65.00

    Lightweight and fast drying, the Pulse LS Zip is a versatile technical base layer, ideal for multi-day climbing and trekking trips.

  5. Cayenne
    New Colours

    Force LS Tee

    $50.00

    The Force LS Tee is a next-to-skin technical long sleeve tee, designed for comfort and freshness during active use.

  6. Ink
    New Colours

    Pulse Hoody

    $80.00

    Lightweight and fast drying, the Pulse Hoody is a versatile technical baselayer, ideal for multi-day climbing and trekking trips.

  7. Ink

    Force SS Tee

    $40.00

    The Force SS Tee is a next-to-skin technical short sleeve tee, designed for comfort and freshness during active use.

  8. Ink

    Pulse SS Tee

    $45.00

    Lightweight and fast drying, the Pulse SS Tee is a versatile technical tee, ideal for multi-day climbing and trekking trips.

  9. Firecracker
    Skyline

    Sonic LS Tee

    $65.00

    Move fast, run light and stay cool with our technical long-sleeve Sonic LS Tee - the next level in mountain running comfort.

  10. Acid
    Skyline

    Sonic SS Zip

    $60.00

    Whether used as a fast-wicking first layer or a technical standalone mountain running top, our Sonic SS Zip is the perfect tee for athletes seeking perf...ormance.

  11. Azure
    Skyline

    Sonic Tank

    $45.00

    With its low weight, ventilated comfort, dynamic cut and bright alpine colours, the Sonic Tank delivers the ultimate in mountain running freedom.