with a t-shirt underneath you're good on cool, sunny days above 50 degrees, and with a base layer(s) you could take this down to 30 or so. i believe a person’s eyes are the window to their inner being. will look forward to seeing your next post when you are recharged. my concerns with making it stand out is security, would i be more of a risk of a break in? smart tank design offers many features, with external flow control available as an option. this book sucked me in (as every great book should), and i could barely put it down! 