and two sizes

and it doesn't restrict movement or breathing

or just about any activity under the sun

Cleat interface: They have a duel sided cleat interface with adjustable cleat retention

Four bolt bar clamp

iXS Flow EVO + Knee Pads - L - Grey PDP|PLP|Brake Rotor Type and two sizesWith the Flow Evo+ knee guard, iXS provides super thin, light and comfortable knee protectors. Developed with mountain bike legend Hans Rey, pads are comfortable enough to pedal in all day and are are super compact to fit any backpack. The integrated Xmatter padding concept provides high impact absorption and protection. The Flow Evo+ introduces product properties like exchangeable padding and structurally improved, latest generation AeroMesh offering