I got these for mtn biking in my home state of PA. I decided to really test how secure the zippered pockets were by wearing them to a rock/metal concert where 50,000 people stood in the pits. I wore them for 2 days of moshing and crowd-surfing and never even had the zippers slip a millimeter. My phone, cash and ID stayed safe despite all the flips, jarring and shoving that is common at an event like this. If you are worried about keeping your valuables safe without wearing a backpack GET THESE SHORTS!