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HALO® Muslin Broken Arrow SleepSack®

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Designed for your baby’s safety and comfort, the HALO® SleepSack® is an alternative to loose blankets that could cover their face interfere with breathing while they’re sleeping. This wearable blanket is woven from soft organic cotton muslin and is an easy transition from the HALO® SleepSack® swaddle. Its smart construction features wide arm and neck openings and a roomy sack that doesn’t restrict leg movement to ensure proper hip development. Plus, it’s Oeko-Tex® Certified to be free from chemicals and synthetics for a healthier night’s sleep.


  • Replaces loose blankets in the crib.
  • Sleeveless design to help reduce the risk of overheating.
  • The SleepSack® has a two-way zipper for convenient dressing and diaper changes.
  • Roomy sack for healthy movement of hips.
  • Oeko-Tex® Certified: Tested in a third-party lab and verified to be free from over 300 harmful substances.
  • Organic Content Standard (OCS) certification. Textiles made of organically grown materials according to the Organic Content Standard guarantees the traceability and integrity of the raw materials during all the manufacturing stages.


  • Made of 100% organic cotton muslin. Organic cotton is grown without the use of toxic and persistent pesticides and synthetic fertilizers.


  • Pottery Barn Kids exclusive.
  • Available in Small and Medium.
  • Small fits babies 3-6 months, 13-18 pounds, 23-26".
  • Medium fits babies 6-12 months, 19-24 pounds, 26-29"
  • Machine wash.
  • Imported.


  • Personalization is available, up to nine characters, for an additional cost.
Dimensions & Care


  • Overall:19" wide (sweep) x 27" long
  • Neck: 3.25" wide
  • Armhole Opening: 4.5" wide
  • Chest: 11" wide
  • Zipper: 21" long
  • Overall: 21.75" wide x 30.5" long
  • Neck: 4" wide
  • Armhole Opening: 4.5" wide
  • Chest: 11" wide
  • Zipper: 21" long


  • Machine wash in warm water, gentle cycle.
  • Wash dark colors separately.
  • Tumble dry on low heat.
  • Do not bleach.
  • Do not dry-clean.
  • Do not iron.
Shipping & Returns


Standard UPS can deliver most in-stock items within 3-5 business days.


  • Available within the contiguous 48 states
  • An extra charge of $26 per address. 
  • Order by 6pm PT Monday through Friday, you'll receive your order the next business day
  • Orders placed on Friday after 6pm PT through Sunday will arrive on Tuesday.
  • Monogrammed items take additional days for delivery.  A delivery estimate will be quoted on your Payment & Review page.


Select oversized items have an additional delivery and processing surcharge; this charge is listed below the item price.

View our complete Shipping and Delivery.


Eligible items can be returned for a refund of the merchandise value within 30 days of receiving an order or 7 days for Quick Ship upholstery items. An original receipt or gift receipt is required.


  • Stores - You can return most non-furniture items to your local Pottery Barn Kids store for free.
  • By Phone - For non-custom furniture and other oversized items, call Customer Service at 1-800-993-4923
  • By UPS - print a return label from our Returns Policy page and bring to a UPS location.


Delivery fees are non-refundable and prior purchases are not eligible for a price adjustment.

  • Monogrammed/Personalized items
  • Made to Order items, including custom rugs and furniture
  • Mattresses
  • Gift cards
  • Final sale items (with prices ending in $.X7 or $.X9)
  • Items damaged through normal wear and tear


For assistance please contact Customer Service at 1.888.922.4119, 7 days a week, 5:00 am - 9:00 pm (PST). We cannot accept returns on final-sale items ending in .99, monogrammed items or items damaged through normal wear and tear. Made-to-Order furniture or rugs are not eligible for returns. Delivery fees are non-refundable.


View our complete Returns Policy.

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