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merinoBASE Unisex Thermal Long Johns

  • View Sizing Guide

    Adult Unisex

    Please note
    All measurements listed below are in centimetres and based on actual body measurements, not garment measurements.
    Size Chest Waist Hips Sleeve Length Inseam
    XS 91 76 91 85 82
    S 96 81 96 86 82
    M 101 86 101 87 83
    L 106 91 106 88 84
    XL 111 96 111 89 85
    XXL (2XL) 116 101 116 90 85
    Please note
    All measurements listed below are in centimetres and based on actual body measurements, not garment measurements.
    Size Chest  Waist Hips Sleeve Length Inseam
    8 88 68 93 78 81
    10 93 73 98 79 81
    12 98 78 103 80 82
    14 103 83 108 81 82
    16 108 88 113 82 82
    18 113 93 118 82 82
    Womens unisex guide


    Measure around the fullest part of your chest, making sure to keep the tape up under your arms and around your shoulder blades.


    Measure around the smallest part of your waist (natural waistline).


    Stand with your heels together and measure around the fullest part.


    Stand with your heels together and measure around the fullest part.

    Sleeve Length

    Bending your elbow slightly, measure from the centre of your spine at the base of your neck, across your shoulder then down your elbow to the wrist.


    Measure from your crotch down to the ground.

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    Quick Overview

    The merinoBASE Long Johns are the perfect thermal underwear leggings, with lightweight, next-to-skin comfort and warmth. The rib knit construction ensures this piece moves with you, perfect! A natural fibre, merino wool cleverly balances your body temperature no matter what the conditions. Warm and breathable, in a unisex fit.

    Features & Specs

    • 1 x 1 rib knit for close fit and movement
    • Merino natural temperature control
    • Anti-microbial, lightweight thermal
    • Flat seam construction for reduced chafing and easy layering
    • Non-itch next to skin comfort

    100% Merino Wool (1x1 Rib, 19.5 Microns)

    Weight Size M 150g

    Customer Rating
    See Ratings Summary

    Customer Reviews

    merinoBASE Unisex Thermal Long Johns is rated 4.0 out of 5 by 24.
    Rated 5 out of 5 by from Best long johns I have purchased to date Purchased two pairs for myself for work for this winter. I am a shift worker working outside every night. Product quality is great, I buy this type of product for winter time, I like the warmth comfort for working outside each night. I wear them under my company issued high vis cotton drill work pants. I don't wear them for a trek, or occasional sky holiday. I wear this product every single night at work in the cold. I have no issues with holes occurring in the product.
    Date published: 2015-05-23
    Rated 4 out of 5 by from Buy the XL kids size if you are a small adult I wear ladies size 6-8 clothes (163cm, 52kg) If you are on the smaller side, I highly recommend buying the kids size XL. Literally half the price (though I recommend trying them on in store first, my legs are pretty short!)
    Date published: 2015-12-08
    Rated 4 out of 5 by from Practical and comfortable I feel the cold so I wanted base layers. I love merino for its warmth and feel plus, recently, I've read that synthetic thermals put plastic in the ocean every time you wash. I love these leggings, which I've worn instead of pantyhose with boots and I've worn under jeans to keep me warm in Canberra's sub-zero nights. My only concern is that, when Katmandu's merino baselayers get holes (which happens a lot, at least in the slightly older tops I have) they're very expensive to have repaired.
    Date published: 2016-08-01
    Rated 1 out of 5 by from Poor Quality Purchased for my wife. Quality is poor according to her comments. very thin and whilst on holidays in cold weather finger went through long johns causing a hole. would not purchase again unless quality improved. Also she said not warm enough for American winters.
    Date published: 2014-11-25
    Rated 1 out of 5 by from Rubbish quality I had one of these from 2009, it was the best. Sadly I lost it while overseas. This one is thinner than tissue paper. I've bought two of them, and they've both ripped to shreds after wearing them for a short while. Go back to your old, GOLD quality. Chuck these in the bin!
    Date published: 2015-07-12
    Rated 5 out of 5 by from Very warm These tights are really warm without the bulk. Highly recommend them.
    Date published: 2015-08-11
    Rated 4 out of 5 by from Great product!! Very comfortable, warm and breathable. The only down side was my sizing as I've got long legs so my pair turn out a tiny bit loose (just not skin tight).
    Date published: 2016-08-01
    Rated 5 out of 5 by from Warm Toasty Warm & Not Smelly ooh yeah more characters required please !
    Date published: 2015-07-22
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    • clientName_kathmandu

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