MEC Espresso's, but I'm exchanging them. The interchangable lenses come out a little too easily, they hold firm, but if you somehow put a lb of force on the tip of the lenses (think oakley m frame, almost the same look), then one side falls out, but it's all one lens, so the other side and the center holds the lens in. This ends up with me having to put the lens back in...*grumble* even if it's a 1 second ordeal.