The Sol Republic Master Tracks professional over-the-ear headphones feature a rugged design and 100% user replaceable parts. This is the main reason behind bringing the Master Tracks headphones into the DJbooth Lab to test them out and see how they would perform from a DJ's perspective. They have a lightweight design and they feel really comfortable. The full HD-Video review will come out within the next few weeks after I've put them through the paces. Check out my unboxing and first impressions video of the Master Tracks headphones in the meantime.