The Altitude Collection is where it all started for ioMerino and includes some of our all-time best sellers - including these tees! Originally designed for snow and on-mountain sports, this range has quickly become our jack-of-all-trades, go-to thermal base layer that can also be worn on its own and is especially popular with runners and hikers. 

Our Altitude Merino Tees are ‘contact fit’, (so they’re designed to hug your body), and are the perfect lightweight thermal layer for core warmth when you’re layering up in the cold, yet versatile enough to be worn on their own in milder conditions. (This natural breathability and temperature regulation makes them perfect for ‘in between’ weather where you might have a cold morning start, but warm up later in the day.)

All Altitude layers are designed to be longer in the body so there’s no cold spot gaps between your top and bottom no matter how much you move, zig, zag, bend, stretch, reach, climb, or whatever else you’re doing. This also makes them 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. 

(If you’re looking for a more relaxed fit, be sure to check out our Universal Tees!)