Obviously other than your helmet. Is it gloves, jacket, boots? Leather pants? Which piece do you really need. I went for a quick cross town ride today to buy a few bits and pieces, and just grabbed my helmet. I felt a little naked, because I was wearing no protective gear. The piece I missed the most - my polarised sunglasses. I found it difficult in the sun glare to not squint, and really missed them. What piece of gear do you always ride with?