Soccer shin guards. These are mini shin guards. This is size S, so please make sure you don't mistake it for size XS. Please check the second image for a comparison between XS and S sizes (*^^*) Size is approximately 10cm x 6cm. These are mini-sized shin guards. My university student son has been using these in official matches since his high school days, and he says they work fine without any problems! He says that with these small shin guards, it's easier to play soccer and fatigue is significantly reduced. I haven't heard of them being unusable in official matches around me, but just in case, please be aware of the possibility. For those in a hurry, I will ship via Rakuraku Mercari (Nekopos) by the next day after purchase!