Here's what other sites are saying:
Opposable thumbs are an evolutionary gift. Keep them accessible with the form-fitting Ibex Men's Shak Freestar Shirt's clean finished thumbhole openings. Made from 100% dense knit New Zealand merino, the Shak Freestar features a full front zipper, invisible chest pocket zipper, contrast details, and flatlock seams. Machine washable.
- Altrec Outdoors refers to the men's version