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.
16 Capita BSOD . 16 NS West . 15 NS Snowtrooper BIA . 13 Salomon Pow Snake
15 Now Drive . 14 Burton Genesis
14 Flow Hylite