Oureamod Mens Boat Shoe No Show Liner Socks Non Slip 5 Pack Imported Materials:80% Cotton/10% Polyester/7% Nylon/3% Lycra Spandex Regular (7-10) Size variation is based on US Men's shoe sizes.And Machine Wash Or Hand Wash Recommended. Breathable cotton blended with spandex for a better fit.comfort toe seaming.Premium Cotton keeps your feet dry and comfortable! Lightweight sock uniquely designed to be invisible and feel invisible. Good for Indoor & Outdoor Activity,Ideal for Loafer/Boat shoes,flats,sneakers,-or even just around the house. Elastic Comfortable Flat Boat Line Socks of Silicone Anti-Slip Heel Grip,giving you enhanced balance and stability,Hygienic alternative to bare feet.Protect feet from unclean surfaces and exposure to foot fungus.It also can be Father's day gift.