I just got a pair of Slider Kevlar jeans off of Ebay today. I normally wear Lee jeans and the Sliders are the same size, fit wise. Get your normal size with these including length. I got 2" longer inseam and it probably wasn't necessary.
They look to be well made and were comfortable even before I washed them. They are warmer than regular jeans due to the Kevlar lining, but not bad even in the 90 degree heat today. I think these will be quite useful in the cooler weather.
Luckily I have no info on how well the Kevlar works on the road and I hope I never do. The ones I got do not have armor.
Here's an article I found on a comparison between Joe Rocket Steel Jeans and Sliders Kevlar Jeans
http://www.webbikeworld.com/motorcyc...ders-jeans.htm
Jeff