Here is great a poncho made with the very strong, durable and shiny Opalo material that has opening only in the bottom and in the head.
The length of a size L/54 from the shoulder to the hem is 127 cm. The width of the poncho is about 70 cm on the shoulders and 118 cm in the hem. There doesn't seem to be much of a difference between M, L and XL sizes.
This one in stock is red in colour.