If they're of fine wool, that's a perfectly reasonable price. I wear exclusively Icebreaker wool t-shirts as undershirts and they're $80 each, and have lasted me for years. One of the incredible things about higher quality textiles (Irish linen, fine wools) is that they tend to get softer and more comfortable with washing, and reach an equilibrium point quickly where they will stay for /years/. I'm wearing an Icebreaker T right now I bought in 2016 that's still in perfect condition and is more comfortable than any T-shirt you've ever put on, I guarantee.

I'm not familiar with Loow's products, but since they're wool and people are saying they are of high quality, I don't think $75 is unreasonable.