- Ability of device to resist pronatory forces and abnormal motion
Shear Reduction - Ability of material to absorb or move with the lateral motion of the foot
Shock Absorption - Ability to absorb sudden vertical forces

HDPE - High density polyethylene, a polyolefin plastic in the same family as polypropylene
LangerFlex™ - Energy absorbing proprietary copolymer
Polydor - Rigid acrylic polymer
Polypropylene Composite - Material made of glass fibers embedded in a polypropylene matrix
Subortholene - Ultra high molecular weight polyethylene
SuperForm - Composite material made of glass and carbon fibers in a polypropylene matrix
Toprelle™ - Hybrid material made from a blend of HDPE and rubber

Biodynamic Heel System - Dual density heel post that promotes weight transfer from lateral to medial during gait cycle. Also resists pronation
Compressible Post to Sulcus - post that extends effective duration of the forefoot post
Single-Density - Term referring to a post with homogeneous consistency throughout
Wedge Post - Post that is placed below filler material

Bottom Cover - Cover used to protect, when necessary, underside of the orthotic against wear
Filler - Material used under the shell to reinforce or increase its shock-absorbing ability
Heel Seat Depth - Depth of the heel section. Deeper heel cups will provide more control.  Lower heel cups are used when shoe fit is a concern
Topcover - Cover used as an interface between the orthotic and the foot.  Sometimes incorporates a soft foam layer for shock absorption
Heel Plate -Plate used to protect the heel post from excessive wear, to reduce slippage or to enhance the shock-absorbing capability of the heel post