As a few of you may know I am new here and have not gotten serious about spearfishing until recently. I just ordered a 5mm and 7mm Speardiver wetsuit because the lakes I dive in can be in the low 40s for a good part of the year. The thing is the vis in the winter can be up to 25 ft, whereas in the summer it can be as little as 4 ft at times. Thus, winter diving has its appeal for spearfishing. For any of you who have experience with these suits in cold water, will the 7mm be plenty for 40 degree waters? Thanks for any input.