Fjallraven call the Abisko Trail T-shirt "a short sleeved t-shirt in cool functional material with wool and tencel. Round neck and raglan sleeves" It's a wonder they sell anything.
Even my first impression was more enthusiastic than Fjallraven's own sales pitch; the question that arose was 'how is this so soft when it's only 15% wool?' If you're a die-hard merino fan, chances are it's based partly on comfort. You won't find the Abisko Trail T-shirt lacking in that regard.
I had to do a little research on the other 85% of the fabric which is made from Tencel. It's a brand name for a type of lyocell, which is a plant-based fibre produced using a non-toxic organic solvent within a closed-loop process. In other words, it's pretty environmentally sound on top of being far more effective than cotton when it comes to wicking moisture.
The trail credentials are rounded out with features such as flatlock seams and raglans sleeves to avoid rubbing under pack straps, and a cut that is longer at the back. The fit is generally athletic, but it does feel like a long, thin person would suit this fit best (I'm 5' 10").
At £45 - which is reasonable in general and super-cheap by Fjallraven's impeccable standards - this seems a bargain in comparison to pure merino products. Especially as it seems to offer the same moisture-wicking, odour-resistant, and soft-on-skin properties. Time will tell how durable the fabric proves to be.