A bright white solid surface sill with a crisp machined edge and no visible seam where the build-up meets the deck. Non-porous, so it shrugs off condensation on the glass above it.

Solid surface is homogeneous through its thickness, which is why the build-up edge can be machined to any profile without a visible glue line — the seam disappears entirely. It is non-porous, so condensation running off the glass cannot soak in, and a scratch sands out rather than needing refinishing. 77 colours are available, from Glacier White through the deeper stone-look patterns.
Living-room sills are often the longest runs in the house, spanning multi-panel windows, which makes the seam strategy and the front edge the two decisions that matter. Whatever the room, the sill is cut to your opening rather than trimmed to fit on site — length, depth, horn projection and corner treatment are all set before it is machined.
Measure jamb to jamb, then the depth from the window frame to where you want the front edge to land, and the horn length past each side if the sill returns into the wall. The configurator draws the piece live as you enter dimensions and produces a dimensioned spec sheet you can hand to an installer. See the measuring guide for the full method, or compare wood against solid surface before choosing.
This image is a rendering, shown to illustrate materials and proportions available through the configurator.