When viewed from the north or south it is seen as a distinct pointed hill in contrast to its more bulky neighbour Beinn Dubhchraig, with which it is usually climbed.

It has two main ridges which connect to the adjacent Munros of Ben Lui and Beinn Dubhchraig and walkers usually arrive at the mountains summit along either of these.

Coire Buidhe stands on the northern side of this eastern ridge, this has a steep headwall and descents north from the bealach to the Cononish glen are not recommended.

Ben Oss lies on the drainage divide of Scotland, all rainfall that falls on the northern slopes drains to the Cononish glen which forms the headwaters of the River Tay and eventually goes to the east coast.

The summit has a prominence of 342 metres and gives a fine vista of the southern highlands, it is a good place to admire the craggy eastern face of neighbouring Ben Lui.