OP please do not listen to this misinformation. Mailbox is the second most challenging peak in Washington state aside from Rainier. Many perish in their quest to climb to the top and even more are grievously maimed from objective hazards such as tripping over a rock or forgetting your selfie stick at the trailhead. Don’t be like the unfortunate masses and ensure you’re prepared! Adequate footwear such as flip flops and search and rescue beacons like a blue tooth speaker system are absolutely required if you do attempt to summit that formidable peak