unifiber sdm hd aluminiumWe present the Unifiber SDM HD Aluminum Extension. The mid range model from Unifiber is suitable for all windsurfers who use newer equipment but still want to keep an eye on their budget. For $79. 95, you get a rock solid Extension that clearly stands out for its durability. If you're not sure whether you need a high performance Extension, this Extension offers a very good compromise between price and performance.