Elbow pads are obviously to protect your elbows. Also if you fall on your arms your could get ice on your elbows and they could get numb. With the elbow pads you can protect your elbows from getting badly injured. 

~Dual cap technology provides stability and protection

~ASD system delivers specific fit and function (Left and right)

~JPD caps designed to prevent direct joint impacts

~Molded asymmetric bicep and forearm parts provide full wraparound coverage and protection 

~Four point attachment ensures snug, accurate fit

~Heat-release liner system enables air dissapation

~2 Piece design  Wrap around ~Forearm      bicep coverage ~Elastic Velcro straps

CCM 1052 Tacks

~Perforated foams and caps increasing ventilation             

~3D mesh providing space between skin and foam allowing airflow over a greater area 

~D-ring elastic straps for customized fit     

~Plastic wraparound calf wings for protection against slashing   

~Plastic wings on side of knee increasing collateral ligament protection ~Extended thigh coverage for protection between knee cap and pants 

Again shin pads are to protect your shin. It is very easy to bruise your knees. I get bruises all over my knees when I go free skating. Shin pads protect your knees when you fall or when you get slashed. 

~New maximized protection knee cap design                ~Foam liner           ~Anatomical ventilated shell                    ~Single foam hydrophobic liner  ~Foam calf protection             ~Two elastic straps