I've been using Dunlop Stubby Triangles 1,5mm version for quite many years. 1,5mm is just enough thickness so that the pick doesn't give in when contacting the string. Although the material is pretty slick plastic, the center groove with its etchings give my thumb a perfect traction and grip. The 2,0mm version is also good, not just that perfect for me, and the 3mm version is too much. To each their own. Anyway, give these a shot if you're looking after a sturdy pick that slides right through the strings with minimal snag.