Earth Day Special • Free Worldwide Shipping On Every Order
Celebrate Earth Day • 50% OFF Sitewide On All Running Gear


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Free standard shipping on orders
We are pleased to offer Free Worldwide Shipping on all orders, delivering to all countries and regions supported by our logistics network.
There are no restrictions on order quantity, parcel size, or shipment weight — every order ships at no cost to you. In addition, all customs duties, import taxes, and government-imposed fees associated with your shipment will be fully covered by us, ensuring you will not incur any extra charges upon delivery.
Please note that delivery times may vary due to local customs procedures and carrier conditions, but your shipping and customs costs will remain completely free under this policy.
We provide a secure and reliable Free Returns service for all customers. Items that remain unused and unopened may be returned within 60 days for a full refund.
All return shipping expenses, including customs-related fees, are fully covered by us.
Refund processing will be completed within 4 weeks from the date the return shipment is sent, regardless of whether the package has arrived at our facility. In general, refunds are finalized significantly earlier, ensuring a smooth and dependable experience.
Graduated compression makes the OS1st Fleet Feet Performance Calf Sleeves ideal for any activity.
The medical-grade compression can help alleviate common overuse conditions, like Achilles tendonitis, shin splints, leg cramps and aching muscles, but it also improves circulation, supports muscles and stabilizes tendons.
Like the OS1st AS6 Arm Sleeves, each calf sleeve employs six zones of compression. Starting from the bottom of the sleeve near the ankle, OS1st uses light compression to stabilize your Achilles tendon. Moving up the calf, zones two and three use firm compression to boost circulation and support important ligaments.
Zones four and five have moderate compression for stabilize your calf muscle and continue to aid circulation. And the top of the sleeve, in zone six, uses light compression for a comfortable fit.
OS1st knits the calf sleeves from soft, moisture-wicking fabrics to give you the most comfortable fit possible.
The Fleet Feet version comes in black with blue and white stripes and a Fleet Feet logo to show off at your next group run.
For the best fit, measure around your leg at the ankle (the narrowest part of your leg) and the middle of the calf (the widest), then match the circumferences to the size in the chart below.
Size | Ankle Circumference | Calf Circumference |
Small | 6.5-8.5 in / 17-22 cm | 9.5-14.5 in / 24-37 cm |
Medium | 8.5-10.5 in / 22-27 cm | 12-17 in / 30-43 cm |
Large | 9.5-12.5 in / 24-32 cm | 14-19 in / 35-48 cm |
X-Large | 12-14 in / 30-36 cm | 14.5-20 in / 37-51 cm |
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