so the flex may vary from brand to brand

They feature Lucky Rebound Technology™ (LRT™)

Rocker Type

Dual Slide Strap Adjustment System

Either way

ExoSkin Knee Pads 110mm wheels so the flex may varyOur lightweight, contoured, abrasion resistant ExoSkin Knee pads are specifically designed to flex and protect the mountain bike and BMX rider. Theyre also great for snowboarding and as a low profile under pant skate pad. High density 8 link foam padding for knee caps Exterior Kevlar cover for maximum abrasion & tear resistance Six padded pockets for key impact areas to the sides of the knee Perforated Neoprene body for breathability Interior terry