Sony Mdr-As100W Active Style Headphones (Discontinued by Manufacturer) Wide 13.5Mm Driver Units Achieve High-Quality Sound With Deep Bass Sleek, Lightweight Design & Secure Fitting For Active Use Shock Absorbing Mechanism To Hep Prevent Noise Transfer From The Cord Moisture Guard Allows For Moisture To Pass Around Headphones Single-Sided Cord For Sports Usage 13.5mm driver units achieve quality sound & deep bass Lightweight & secure fitting headphones for active use Shock absorbing mechanism helps prevent noise transfer Moisture guard for moisture to pass around head phones Three sizes of earbuds (S, M, L)