Didn’t try anything with a load on them, so I’m not sure how they will perform in that regard. Highly recommend for adventurous children. This set knocks that out of the park, the quality of sound is amazing, and I can still hear things that are going on in my peripheral. I can wear them for almost the entire day! really need almost double that amount. With the 280s the sound is right on top of you, directly in your head, while the 555s are more open sounding with a broader range of sound from left to right. 5 inch in the morning (measuring it without food/water). Sound quality is absolutely amazing and its very easy to carry in your pocket while traveling. It says that the bones are steel but I find it hard to believe but I will not know unless I open one up other then that a very good product! Given the way shoe style come and go I ordered a second pair to have in inventory for when the first pair eventually gives out.