These earbuds are attached via wires that are connected to a spring-loaded mechanism - a bit like the power lead on most vacuum cleaners - so when you're finished using them you press a small button on the top of each arm and the wire is quickly retracted back into the body of the sunglasses.
Thankfully, TriSpecs hasn't skimped on the optics as the sunglasses use Sola Sunlenses, which are made by a division of Carl Ziess. These lenses are made from polycarbonate and as they're impact resistant they should stand up to a bit of abuse. Naturally, they also filter out UV light to protect your eyes from damage by the sun's ray, and they're replaceable so if you scratch them you can order new ones from TriSpecs.