The twin peaked mountain is one of the most conspicuous landmarks visible from Puget Sound. This can be a "double summit" day for the ambitious party, tagging both North and South Brother, adding 2+ hours to the day. Tricky routefinding might make for a long outing. Be prepared for sustained 35 degree snow climbing, with a 45 degree step near the top. Rope, axe and crampons are required.