Apollo program astronauts stuck a Velcro strip in their helmets to scratch
their faces when they got an itch.

Velcro is a hook-and-loop nylon fastener that is part of many of the
products we use today. It is commonly used as fasteners in shoes, athletic
equipment, uniforms and bags. It's also available in stick-on form for
household uses. This strip fastener has not only been used by millions of
people around the world, but also in space flight.