Just last night I darned a big unravel spot in my wonderful old cashmere wool glove liners. I think it's fairly common to have wool gloves start coming apart in one spot or another. They are not as tightly woven as heavy socks. Either ask Smartwool or the store to replace them, or else just get used to darning little holes and loose seams in wool. I'm kind of used to darning little wool holes and unraveled seams spots at this point. The trick is to get them when they are just starting. Use a single thread so it's less bulky, and don't pull the wool together so much as to pucker it needlessly.