Special double seams form the end of the sun sail. These are particularly necessary for tight tension. If a sun sail is not correctly assumed, form so -called. "Books" there collects water and dirt. This reduces the quality and durability and is also unsightly. We only send insured goods, so it can happen that some products appear as if the shipping costs are somewhat expensive compared to the product. However, if you buy several items from us, only pay the shipping costs once. In this case, please let us know if you have done your purchases, we will then adjust the shipping costs. Please only make the payment. Immediately after receipt of payment, our mail order company (DHL, forwarding agent etc.) receives an electronic pick -up order. From now on you always have.