Do they wear high, above the knee, or are they the typical board-short that hang down past the knee? I NEED a pair of shorts like the ones they have on TUFF. Board-short style the length of muay thai trunks.

Mike,
They are the same design as Machida's shorts shown here: http://ufcgaming.com/wp-content/uploads/2012/08/machida-vs-bader-2-630x419.png

Only difference is the color scheme. It's that cool new Venum design that has a light stretch fabric at the bottom hem, only Machida's are a contrasting yellow stretch fabric and these Silva shorts are black on black. To answer your question, same fit as the Machida pic.

I have this in white/red bottom/same style. the length is right above the knee. I am 5 10 170lbs. A lot of Venum style sizes are not consistent so I typically size up. I am a true 32-33 waist. A 33 medium fits just right but snug, so I usually buy a large 34 and adjust drawstring for training and room to move athletic quads, I think this style is cut shorter than the regular Venum styles though