Here's what other sites are saying:
When worn underneath your hiking socks, the REI EcoMade CoolMax Liner socks offer a moisture-wicking, breathable, quick-drying barrier. EcoMade CoolMax(R) is made of recycled PET polyester.
Where to Buy
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REI CoolMax Liner Sock
REI Recycled Polyester Liner Socks
REI Silk One Liner Sock
Fox River X-Static Liner
$11 - $12
Smartwool Hiking Liner Crew Sock
$9 - $11
Terramar Silk/Nylon Mid-Calf Sock Liner
$12 - $20