I'm using both 3DF 5.0 (zippered) and 3DF Ext (sleeved), both are great although the 5.0 cause mild discomfort behind my left hamstring whereas the Ext's don't,
This only occurs whilst seated, and I suspect the reason lies in the Ext being secured with velcro around the calf and I'm not relying on the hammy velcro to keep it in place. However the 5.0 relies upon the hammy velcro to keep its place (both have upper silicon bands).
I've had 3 'dirt naps' whilst wearing the 5.0's and confirm they well exceeded expectations (I didn't feel a thing). Would recommend either model under adventure/enduro pants but err toward the Ext's if they fit inside your boots (Ext's fit my TCX but not Gaerne boots). Either way, a quality product worth the spend.