I've been rockin A frames for the last 8 years. Easy to change out. If They get wet inside or Fog, only use the Oakley micro bag to blot them dry. If you use anything else, or if you wipe the inner lens rather than blot when wet you will have a permanently damaged lens. (the inner coating of the goggles will smear leaving them to be no better than a smeared window forever). My $70 mistake. :( No Bueno. HOPE THIS HELPS YOU!!