lock grips on Flickr.

I am not saying locking grips are mandatory, but if you live somewhere hot, you should look into them.

Eventually the AZ sun and heat softens grips. They spin on the bar, they slide around, they get sticky, they suck.

If you have black grips, they make the palms of your hands black after a few years. Colored grips like these still have that problem in the heat, but it takes a couple a little longer for them to break down.