The Yellow Cap is only a virtual representation which you can receive for having the highest score in a pool for a specific round. We do not send out actual Yellow Caps if you have won a round in a pool. Consider this, as there are thousands of pools within each tournament on SuperBru (of which many have 20+ rounds) we'd have to spend millions of dollars every year on caps alone if we were to send out real caps to each round winner in each pool (not even taking into account the mammoth task of coordinating the logistics of distributing them). We wish we had that kind of money to send everyone a free yellow cap, but that's simply not the reality!
If you'd like to be the proud owner of a SuperBru Yellow Cap, the good news is that you can buy one from the BruStore.