You need the L/XL. Doesn't matter if your boots are the lowest profile ones out there. the S/M is a tight fit even with low-pro boots in 8.5/9.0.
15 LibTech TRS HP . 15 NS Snowtrooper . 15 NS Ripsaw . 13 Salomon Pow Snake
15 Now Drive . 14 Now Drive
14 Flow Hylite