Mount-It! Foot Rest Under Desk, Large 17.5×13.5 in, 20° Tilt & Texture

From the brand

Room to actually rest both feet: A cramped, undersized footrest defeats the purpose. This one gives you a full 17.5 x 13.5 inch platform with a gentle tilt up to 20 degrees in either direction, so both feet land flat and supported, not squeezed onto a narrow pad.
Backed for as long as you own it: A lifetime manufacturer warranty and US-based product support come standard, well beyond what similar footrests in this price range typically offer. It arrives fully assembled, ready to use right out of the box.
Tilts to match your leg length: The platform moves through 20 degrees in either direction, so you can find the angle that fits your height and how you sit, rather than settling for one fixed position.
A textured surface, not a flat pad: Raised ridges across the platform give your feet something to move against, whether you are propping up for a break or shifting position throughout a long stretch of typing.
Padded grip underneath, texture on top: A rubber grip base helps keep the footrest from wandering during normal use, and the textured top keeps feet from sliding off the platform. Works best set up on a flat, even surface.
Fits under almost any desk, stays out of the way: At just 3.75 inches tall, the lightweight plastic platform tucks under standard desks without crowding your legs or catching on drawers, there when you want it and out of sight when you do not.
For home offices, classrooms, and everywhere in between: Straightforward enough for a first-time user, and roomy enough for a home office, a study desk, a classroom, or a shared workstation where more than one person needs a place to rest their feet.