66North Grettir Tee review: The Grettir is an ultralight, breathable tee made for outdoor adventures of all kinds but perfectly suited to gym work too, writes Kieran Alger.

Icelandic outdoor clothing king 66North knows a thing or two about kitting up to tackle big outdoor adventures and this multi-purpose, super-light T-shirt is built for everything from running and hiking to cycling and climbing. As the best workout clothes go, this is one of the best tees for most gym sessions, too. 

Men’s Fitness verdict

Thin, minimal and highly breathable, this rapid-drying tee is ideal for sweaty gym workouts. It also comes with a generous repairs-for-life guarantee.
  • Incredibly lightweight
  • Repairs for life
  • Sizing comes up small
  • Limited colour options

How we tested the best workout tops

Our team of reviewers are experienced testers of all manner of fitness kit. While testing out this backpack, MF tester Kieran Alger assessed the top in terms of comfort, fit, and sweat-wicking capabilities. He also paid close attention to any high-tech features on offer, such as the inclusion of infrared technology. The testing process involved wearing the top through a range of varied workouts, from longer runs and gym classes to lifting sessions at the gym, to see how the top performed.

66north workout tee close up, showing lightweight material
The fabric blend is thin, minimal and highly breathable. In fact, it’s so light it virtually disappears once it’s on.

66North Grettir Tee features

The polyester, Tencel and Spandex Polar Delta fabric blend is thin, minimal and highly breathable. In fact it’s so light it virtually disappears once it’s on. The fit is skin-huggingly snug, making this another workout tee with a base-layer feel. It’s also quite textured, even on the inside, which presents a little added chafe risk.

However, the fact that it’s so thin and light means it’s quick drying so it doesn’t suffers from any nipple-bothering sag, while flat seams also help boost comfort levels.  

The 66North Grettir tee only comes in red or yellow, with six sizes from XS to XXL. It does come up quite small though so we’d recommend sizing up. 

66North Grettir Tee: performance on test

When it comes to working out, the sleeves are nice and high, leaving your guns free to move. However, the T-shirt isn’t cut quite as low as we’d like, so coverage isn’t the best during big-reach drills.

The Grettir also features a new Fresh Face anti-odour fabric technology, derived from mint, that works like other metal-based products to kill off the bacteria that make your gym kit whiff. It works, too, with the tee standing up to a multiple-use sniff test. 

A big plus for 66North is its after-sales service, with the Grettir coming with a repairs-for-life guarantee. 

Materials:51% polyester, 45% Tencel, 4% elastane
Sizes:XS to XXL
Features: Breathable mesh fabric / odour resistant / repairs for life scheme
Colour: Wild Thyme / Shore Lichen