Best material for sweat absorption (merino, tencel, synthetic, mixture)

I am sweating quite a bit and I have been running for years in cheaper merino t-shirts all year long (mix of merino wool and synthetic materials). I have decided to order couple Ortovox 100% Merino t-shirts to give them a try.

I am hoping Ortovox t-shirts to absorb more sweat (mainly on my back) and to not feel the coldness which I feel in other t-shirts.

What is your material choice when it comes to running?