I roll them up and tie them at the top in summer, having removed the battens which hold them in place over the winter. Being transparent, they let plenty of light through, but it gets a bit hot in summer if thy stay down, especially as there's a clear corrugated roof to the run. Howev, there are some big trees which provide good shade by 1.00 onwards in summer.dinosaw said:. Do you not leave your tarps up in summer for shade?