I thought I'd show the cloth beam of my loom with the blanket wound around it to illustrate the usefulness of a temple. Ellen posted a link to this DIY temple (free - just use household items), but you can spend $$$ for a good sturdy stretcher-type if you like. You can see that the cloth started to draw in, but after I applied the DIY temple to either side, it stopped drawing in and remained a constant width. I used a paper clip, some cotton string, and some large brass nuts. It did distort the cloth a bit at the insertion points until by trial and error I figured out a good weight.