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PLD.TEK via Amazon [amazon.com] has 2-Pack Umisleep 400 GSM Microfiber Hair Towel Wraps on sale for $9.99 – 40% off when you apply promo code DJ4E08OW at checkout = $5.99 ($2.99 each). Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.