The left side shows the kevlar material in the seat of the pants and also the strip that runs down the outside of the leg.
The right side shows the front where the kevlar knee material is.
You'll be hot as hell on a 90*+ day but in cooler temps ( under 80* ) they're great. I wore them on a hour early morning ride to Pocono Raceway doing about 75-80 mph up the turnpike ( air temp was low 50's) and was extremely comfortable.
The sizing runs true to men's jean size. Measure your waist and inseam then order that size.
Jeff