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Celsius Tee

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Colour
Blush
Black
Dusty Navy
Light Grey Marle
Size

We know what you’re thinking: how will a merino Tshirt keep me cool when it’s warm? Well, we’ll tell you! We’ve blended our softest, finest merino, together with a special blend of plant fibre, to come up with a fabric that will keep your core comfortable and cooler for longer when the temperature rises.

The Celsius Tee is part of our Summerino range, and it features our coolest ever fabric, that is naturally breathable, temperature regulating, moisture wicking and odour resistant - and feels ridiculously good next to your skin.

It’s designed to be worn in milder to warm weather, but really the easy fit delivers performance and comfort all year round. Whether you’re pushing hard, doing not much at all, or something in between, go with the io Women's Celsius Tee to feel good no matter how warm it gets outside.

The Celsius Tee has a versatile and relaxed fit, with a drop back hem for extra coverage.

Pair with a Zodiac Crop Top to maximize comfort, style and MicroMerino® performance.

Why you’d buy this: You want something extra lightweight for warmer weather, or you’re more prone to overheating even in cool weather and want the lightest merino thing you can get your hands on. And you want something natural. This one blends merino with plant fibre so it’s still super natural which means almost no microplastic issues when you wash it or landfill when you’ve finished with it.

As with all our clothes, the merino delivers natural temperature regulation, breathability, moisture wicking and odour resistance.

Designed to have a casual, relaxed fit. True to size.

Model wears size small in Black.
Model specs - height 167cm, chest 78cm, waist 63cm, hips 81cm.

Model is 5'8" and wears size small in Dusty Navy, Blush, and Light Grey Marle.

Size Guide. Casual Fit.

Warm Weather 

Hiking

Running 

Yoga

Extra lightweight 150gsm

18.5 microns

45% Australian Merino Wool

45% Tencel

10% Nylon

BENEFITS OF MERINO

LIGHTWEIGHT

THERMO REGULATING

SUPER SOFT & COMFORTABLE

BREATHABLE

MOISTURE WICKING

ODOUR RESISTANT

NATURAL

ETHICALLY MADE

Customer Reviews

Based on 11 reviews
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Grace I (Melbourne, AU)
Tees for Summer all Set

I have both Celsius Tees and Tanks and alternate wearing with hot weather summer days, mornings and evenings. The more you wear the more better it gets, it's at first climatsing for new experience wearing Merino in summer and these are lightweight Merino and durable too with fabric so is a win-win. What I found was if reached for synthetic as appeared cooler choice fabric wise for skin etc for hot weather it was the opposite in comparison with IO Merino once wearing IO Merino more often so it's a all new experience discovering IO Merino working exceptionally for Summer OVER Synthetics. It's a must try and for myself it's a Must Have and living and living in IO Merino has become quite the way of life for myself and added versatility for being out doors in beautiful casual gear. Soft sleeves and fabrics and loose fitting beautiful for warmer/hot weather. The Celsius tanks works best hot days I found and Celsius Tees I wear summer mornings and evenings or cloudy days. Best of both worlds Celsius Tees and tanks for hot/warm weather. It's all I have come to reach as I found is the best to reach for comfort factor alone in hot weather in comparison with other fabrics and more discover this when wearing IO Merino more often it then becomes more obvious when reaching out for tees and tanks to wear is what I found for hot weather and why living in these tees and tanks over summer and IOMerino temp regulating properties which serve for differing weather temps and changes/time of day. I handwash mine then so quick to dry inside home also.

M
Michelle Crick (Adelaide, AU)
Love the colour and bonus it's super comfy!

My first IsoMerino purchase and I love it. Super comfy and warm without being hot. I bought this for warmer weather but been using on runs already in September and I'm impressed with the versatility - hoping it will perform just as well on warmer days. Very happy with my purchase and will be on the look out for more.

A
Anonymous (Sydney, AU)
Great t shirt

I am quite fussy about t shits and am loving my new celcius t. It's comfy and stylish and goes with lot of different outfits. And merino!

S
Sharon Sprott (Adelaide, AU)
Awesome for summer

So glad I bought the Celsius t-shirt! It's awesome! So light and cool feeling. Perfect for the very hot days of summer. I bought my usual size and the fit is perfect. (I size up for the Altitude range.) Thanks io!

H
Helen Clark My new tops (Thomastown, AU)

Love the tops I purchased cool and comfortable have worn them to gym and bike ride

J
June Ward (Melbourne, AU)

Great product. And it’s Australian & it’s pure wool!!