Check out
http://www.aquaveeonline.com/ I found that company in the classifieds section at the back of Triathlete magazine. I got their bungie cords and have been pretty happy. In the summer I have the ocean to go swim in but in the off season all I have is the pool at my gym. But with the Aquavee I can just swim and swim without having to do turns or anything. Havent noticed an impact on my form or anything.