That's weird, because I am still wearing the same Icebreaker t-shirts I bought in 2015, a decade later, through many many washes. They have thinned out some, and I've added more new shirts over time to my rotation, but the very first one I bought is still perfectly wearable as a daily undershirt. I've never had one shrink, I do have some small holes in the oldest shirts, but nothing that impedes its basic function.