These low profile arms are a perfect solution for low profile arms under a tunic, they are nearly invisible and offer great protection, low weight, and easy movement. The arms are formed Kydex and the elbows are now our newer nylon elbow cops.  New picture is forthcoming.  

They come in 2 different sizes.  Please measure your forearm from wrist bone to elbow.  Subtract 1" from that measurement (to account for cop at elbow) and order that size.  For example, your forearm measures 10". Subtracting 1" = 9".  Order a medium.  ** Most everyone is typically a Medium.  Larges are typically too large. **