Merino is incredible for the lack of smell. I go on several 7-10 day backpacking trips a year where I am hiking for 10-15 hours a day and I wear the same shirt for the entire trip. It doesn't smell GREAT at the end, but it doesn't smell bad either. Merino is also very expensive. All my base layers are merino. I like icebreaker shirts and prefer smartwool socks. I usually buy it from thelasthunt.com at steep discounts. A sweater made of merino is somewhat unnecessary to me. You're paying a lot of money for the anti-odour properties of merino when you don't really need them because it doesn't go next to skin.