Vortex Topo-Map Long Sleeve
This topo-map-inspired design looks great and is guaranteed to let you know where you stand - which is right where you are - as part of the Vortex Nation. Experienced orienteers will tell you the long-sleeved design will keep your arms warmer than short sleeves in cooler weather - because they're longer and cover more of your arms. Here's the best news. All this incredibly useful navigation information comes free with the shirt.
Center of the riflescope tube from the top surface of the mount base.