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  • Home / Altitude Range / Page 1 of 2

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    Product type

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    Men's and Women's Altitude Thermal Base Layers

    The Altitude Collection is where it all started for io and includes some of our all-time best sellers like the Women's Altitude Crew and the Men's Altitude Zip. Originally designed for snow and on-mountain sports, this range quickly become our jack-of-all-trades, go-to thermal base layer. With 96% superfine, temperature regulating merino and a snug, contact fit, the Altitude Range is the perfect lightweight thermal layer for core warmth when you’re layering up, but just as comfortable worn on its own in milder conditions if you don’t mind a figure hugging fit. (If you’re looking for all the performance in a regular or casual fit, try our Ultra or Universal ranges!) Which is why people who know, go with io. Because it’s incredible outside.

    Altitude Crew
    Altitude Crew $110.00 AUD
    Altitude 'Stripey' Crew
    Altitude 'Stripey' Crew $110.00 AUD
    Altitude Neck Warmer
    Altitude Neck Warmer $35.00 AUD
    Altitude Zip
    Altitude Zip $120.00 AUD
    Altitude Crew
    Altitude Crew $110.00 AUD
    Altitude Crew - Run All The Trails Original
    Altitude Crew - Run All The Trails Original $110.00 AUD
    Altitude Zip - Live To Run Back
    Altitude Zip - Live To Run Back $120.00 AUD
    Altitude Zip
    Altitude Zip $120.00 AUD
    Altitude Tee - Southern Cross
    Altitude Tee - Southern Cross $100.00 AUD
    Altitude Tee
    Altitude Tee $100.00 AUD
    Altitude Tee
    Altitude Tee $100.00 AUD
    Altitude Tee - Run All The Trails Original
    Altitude Tee - Run All The Trails Original $100.00 AUD
    Altitude 'Stripey' Tee
    Altitude 'Stripey' Tee $100.00 AUD
    Altitude Hooded Zip
    Altitude Hooded Zip $135.00 AUD
    Altitude Crew - Live To Run Front
    Altitude Crew - Live To Run Front $110.00 AUD
    Altitude Crew - Live To Run Back
    Altitude Crew - Live To Run Back $110.00 AUD
    Altitude 'Mongrel' Crew
    Altitude 'Mongrel' Crew $130.00 AUD
    Altitude Brief - Ready For Adventure
    Altitude Brief - Ready For Adventure $45.00 AUD
    Altitude Boxers - Heavy Duty
    Altitude Boxers - Heavy Duty $60.00 AUD
    Altitude Crop - Ready For Adventure
    Altitude Crop - Ready For Adventure $65.00 AUD
    Altitude Hooded Zip
    Altitude Hooded Zip $135.00 AUD
    Altitude 'Mongrel' Zip
    Altitude 'Mongrel' Zip $135.00 AUD
    Altitude 'Mongrel' - Outsider Edition
    Altitude 'Mongrel' - Outsider Edition $130.00 AUD
    Altitude Tights - Ready For Adventure
    Altitude Tights - Ready For Adventure $105.00 AUD
    Altitude Tights - Ready For Adventure
    Altitude Tights - Ready For Adventure $105.00 AUD
    Altitude 'Stripey' Zip
    Altitude 'Stripey' Zip $120.00 AUD
    Altitude Crew - Live To Run Front
    Altitude Crew - Live To Run Front $110.00 AUD
    Altitude Crew - Live To Run Back
    Altitude Crew - Live To Run Back $110.00 AUD
    Altitude 'Mongrel' - Outsider Edition
    Altitude 'Mongrel' - Outsider Edition $130.00 AUD
    Altitude 'Mongrel'
    Sale
    Altitude 'Mongrel' $110.00 AUD $130.00 AUD
    Altitude Crew - Run All The Trails
    Altitude Crew - Run All The Trails $110.00 AUD
    Altitude Crew - Run All The Trails
    Altitude Crew - Run All The Trails $110.00 AUD
    Altitude 'Mongrel'
    Altitude 'Mongrel' $130.00 AUD
    Altitude Crew - Run All The Trails Original
    Altitude Crew - Run All The Trails Original $110.00 AUD
    Altitude Tank - Keepin' It Real
    Altitude Tank - Keepin' It Real $80.00 AUD
    Altitude Tank - Live To Run
    Altitude Tank - Live To Run $80.00 AUD
    Altitude Zip - Live To Run Back
    Altitude Zip - Live To Run Back $120.00 AUD
    Altitude Racer Back Tank
    Altitude Racer Back Tank $80.00 AUD
    Altitude Tank
    Altitude Tank $80.00 AUD
    Altitude 'Stripey' Racer Back Tank
    Altitude 'Stripey' Racer Back Tank $80.00 AUD
    Altitude 'Mongrel' Tee
    Altitude 'Mongrel' Tee $110.00 AUD
    Altitude 'Mongrel' Tee
    Altitude 'Mongrel' Tee $110.00 AUD
    Altitude Tee - Southern Cross
    Altitude Tee - Southern Cross $100.00 AUD
    Altitude Tee - Live To Run Front
    Altitude Tee - Live To Run Front $100.00 AUD
    Altitude Tee - Live To Run Back
    Altitude Tee - Live To Run Back $100.00 AUD
    Altitude Tee - Live To Run Back
    Altitude Tee - Live To Run Back $100.00 AUD
    Altitude Tee - Run All The Trails
    Altitude Tee - Run All The Trails $100.00 AUD
    Altitude Tee - Live To Run Front
    Altitude Tee - Live To Run Front $100.00 AUD

    All Altitude layers are designed to be longer in the body to tuck into your outer layers or sit over bottom layer so you don’t have exposed cold spots when you’re on the go. Ideal for bike riding where you’re bending over and you don’t want your top to ride up, and on mountain sports to avoid any exposed skin. 

    The Altitude Range is ‘contact fit’ to maximise thermal properties and sit flat under other layers. Made with 96% superfine Australian Merino and 4% Elastane to give extra stretch. Designed to be body-hugging and tight all over.

    These layers are perfect for snow sports, cycling and running. 

    For a looser fit base layer, try out Ultra Collection. 

     

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    Let customers speak for us

    from 1956 reviews
    Cute

    I ordered one size up as advised in the product description and it fits perfectly. I love the stripes. Have not yet worn it on a run due to weather but I love wool and expect it to perform well.

    Erika Thomas
    Altitude 'Stripey' Racer Back Tank

    Feel amazing on. True to size and love the two side pockets. Will purchase again.

    Kym Weidner
    Pace Compression Bike Shorts

    Reliable brand. Great quality. Australian. This would be the fifth pair purchased for this household. Highly recommend.

    m.f.
    Stride Tracksuit Pants
    Socks

    Very comfortable and breathable socks.
    The fit and size are spot on.

    clare stacey
    No Show Socks
    Perfect T

    I’ve not worn a T in my life that works like the IO. From Exmouth to Adelaide this T worked as described by the company

    Stephen Boyd
    Universal Tee - Austrailio
    Raglan Tops - Outstanding Value

    Great for a cold weekend away (at Wonderland), or smart to wear at work with a Pinnacle Top. Such good quality, I bought 2 if each. The colour has not faded after 3 years wear.

    Jennifer Watkins
    Zone Raglan
    Arm warmers

    Highly recommended. Non-slip, snug, warm, comfortable and I love the Peaks & Trails logo!

    Greg Kew
    Pace Arm Warmers - Peaks & Trails

    Warm, snug, great colour

    Joan Tibballs
    Altitude Crew

    The only socks I wear for work, they feel great and never smell.

    David
    Hiking Socks
    Black yoga pants xxl

    Very comfortable , great length , fantastic for travel, would recommend, great quality

    Bernadette Hogan
    Yoga Pants

    They are great, warm, and comfortable even while running.

    Ann Dohnt
    Altitude Neck Warmer
    First impressions

    Good fit good comfort

    Clifford Grove
    Altitude Boxers - Ready for Adventure
    Love it

    Looks and feels great. Has kept me warm under my jacket in Boston. My second one of these and love it

    Vanessa Magrath
    Ultra Zip
    Comfort and smart enough to wear out

    Comfort and smart enough to wear out.

    susan finnigan
    Glacier Tracksuit Pants
    Worth the expense

    Best and most comfortable merino clothing for the UK and Canada winter. A must buy is the base layers. Tops and leggings. Very happy with my purchase.
    Easy to care.
    Can't wait to use my gear for next trip to Finland 2025.

    Graham White
    Altitude Tee - Southern Cross