The most comfortable shoes I have and I have a lot of them. They're comfortable with or without socks and will make your feet sweat.
Men's Merrell Jungle Waterproof Slip-On Loafers in Gunsmoke - Shoes for Superior Comfort and Style
47 Review
Merrell Men's World Vue Black Loafers & Slip-Ons
48 Review
Dansko Wynn Slip Black 8 5 9 Men's Shoes
55 Review
Wool Blend Slippers Heathered Leather Maximum Men's Shoes and Loafers & Slip-Ons
58 Review