Socks can also be run from a front fairing to an A-shaped framework on the back of the seat.
A tailsock using lycra fabric and small aluminium tubes adds very little weight.
Empirical results indicate that a faired tailbox can increase speed on a low short wheelbase bike by around 5 to 10%, but this has not been validated formally.
The most exotic machines have lightweight full-body fairings, tested in wind tunnels, but these are not practical for street use.
A velomobile has a fully enclosed body, is usually a three-wheeled design, and protects the rider in all weather.