The Double straddle: the SB has posted, BB posted, UTG has straddled and now the player after UTG makes it a double strabble. Occasionally it will be more - Like 2.5bb. Normally, the straddle amount will be double the big blind. The straddle is always placed by the first to act (the player UTG) after the posting of the blinds.

The straddle is a blind bet added to the pot by the small blind with the intention of inflating the pot.