Castelli Primaloft 13 Sock
- PrimaLoft® polyester fibers and 20% silk are blended together to supply excellent thermal regulation, moisture management and breathability. The versatile fabric blend makes these socks comfortable year-round, whether you're doing long rides or roaming around town.
- PrimaLoft® synthetic insulation provides outstanding warmth with excellent moisture management
- 20% silk for extra softness
- Reinforced toe and heel areas