I try all the new sport line from Sennheiser . these be comfortable and have excellent range of sound from the high to the low . one cord = less tangle and `` fooling '' to adjust single earpiece as you walk or run . when not use at work , they fit nicely around you neck . with single bud , they dangle or get cord tangle up . Thesework well with my sunglass also . light , no pain in ear at all even after 2-3 hour straight wear . the `` twist to fit '' be clumsy to try and fit . Trust they will move out of position when you walk or move you head thus lose all bass . the clip on version be a joke . hard fit , no bass . . barely rest on you canal . I be a big fan of the Sony Fontopias for the `` in ear sound '' -lrb- that drown out noise ... for when I study -rrb- . these Sennheiser behind the neck be my second pair . you can still hear ambient sound . recommend if you be active or like the idea of one cord and one piece set up . . best to not wear a collared shirt with these but rather a tshirt . the back of the brace will keep bump the collar when you move you head up or down or sideways and be annoying . Tshirt have best clearance . unless you stare at the ceiling all day .