The Greenland kit is warm but not overly so. I walk/stalk and use high seats. It is ideal in other than warm weather. Its designed to keep the user warm and dry, which is achieves admirably. Definitely not for summer wear when the sun shines though.
I am currently trying to establish which (if any) Shooterking trousers are suitable for staying dry but cool in summer. Unfortunately the advertising is unclear on that aspect and I haven't yet had a clear answer from retailers, so keeping an open mind and closed wallet on that one at present.