bleacher

valkaisija One who, or that which, bleaches.
puhekieltä A stand of tiered planks used as seating for spectators.
1999, Jim Puhalla, Jeff Krans, Mike Goatley, Sports Fields: A Manual for Design, Construction and Maintenance - Page 371:

Warnings such as "watch your step" can be provided when there is a small step off a bleacher to the pavement or ground level.

We prefer bleacher seats to Grandstand Sections 1-9 . And in truth, quite a few bleacher seats offer a better view of the action than the Right Field Boxes do. Bleacher seats are made of comfortable plastic, ...