Let off is the amount of weight you hold.....Bad explanation.....Let's say you pull a 100 pound bow, and it has 85% let off...you are only holding back 15 pounds...make sense?

Brace height is the distance from the string the the throat of the grip. Generally speaking, the shorter the BH the faster the bow, the longer the BH the slower the bow.....

The Midas IV promises to be a great bow. Both the Midas II and III were fantastic. They come w/ 10 full inches of DL adjustment, in 1" increments, and are very fast....The Midas III is rated at 275 fps....Not too awefull bad for 28" and 40 pounds.....