I’ve bought some Troy Lee KG5400 knee pads (as recommended on here) in both S and XS sizes. Bought the XS as I found the S felt a bit loose as if they might slip down. The XS feel quite snug but not uncomfortably so, but it seems like I’d definitely notice them after a day’s riding, whereas the S are loose enough that I might not. Would be a pain to have the knee pads slipping down and having to pull them back up all the time though. The question is, how snug do they have to be to stay up? The suggested weight range is also a bit disconcerting as in theory I’m actually too heavy even for the S. Can’t really wear them enough to find out, as I want to be able to send the wrong size ones back.