I realize that you are less likely to fall off a Spyder, but I implore you not to ride anything without gloves. Of all your protective equipment, they are number two, second only to your helmet. When you fall, your immediate instinct is to put down your hand. Road rash of the hand is extremely painful, and does not heal readily. Long recovery time, and often lasting disabilities from damage to the exposed nerves, ligaments, and tendons. In addition, nothing hurts worse than taking a June bug or love bug in the hand at speed. Very distracting, at very least. If hot weather is a concern, there are perforated, and even fingerless gloves. For more protection, there are gauntlet gloves or gel palm versions. No matter what you do with the grips, wear some gloves while riding...please!
-Scotty