Beyerdynamic has got together with portable hi-fi honchos Astell&Kern to create the sleek and futuristic Xelento – new in-ear headphones for those who enjoy their music in high resolution. The engine of these headphones is the Tesla drivers that give an extremely wide frequency response (this means deep, deep bass and crystal clear high tones). Thankfully, they’ve also built these to last using sweat-resistant housings and Kevlar-coated silver-plated cables tested in 40,000 bending cycles. The gold-plated MMCX plugs ensure a good contact as well as easy replacement, so these Xelento headphones should withstand years of outdoor use under even the harshest conditions.