Sky Cap Skylight Window Shade - 2 x 2 Square (28"x 28") Removable heavy duty UV resistant outdoor fabric for skylights and roof windows. Skylights vary widely: EXTERNAL MEASUREMENTS ESSENTIAL! Please use Measuring Guide at left. Fits skylights 26"-28" x 26"-28". Blocks 80% of heat, UV and glare, while preserving filtered view of the sky. (Not intended to completely darken.) Must have frame edge overhang (lip). Perimeter cord secures beneath frame edge. (Not for hinged, flush-flashed, or skylights with rain diverters.) Other sizes are available on related Amazon pages, or call for custom sizes.