Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose
Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose
Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose
Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose
Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose

Woolino Merino Wool 4 Season ULTIMATE Sleep Bag - Rose

Regular price$129.00


The award-winning 4 Season® Ultimate Toddler Sleep Bag keeps your toddler at a perfect temperature throughout the night, year-round. That means there’s no need to worry about which weight sleeping sack to use, or whether your child will be too hot or cold while sleeping – they’ll always be just right!

Made with super-fine and supremely breathable merino wool, it helps keep your toddler warm when it’s cold and cool when it’s warm. That temperature regulation means that your child will sleep comfortably throughout the night– and that means a better night’s sleep for you too.

It comes in a universal size that fits kids from 2 to 4 years. It saves you buying a different sleeping bag for different seasons, as well as buying larger ones as they grow. You just need one Woolino sleep bag for your toddler that will fit for 2 years.


  • 100% Natural 
    Silky-soft hypoallergenic merino wool lining and the finest organic cotton outer.
  • 4 Season use 
    Unlike other brand sleep sacks that come in either winter or summer weight/TOG rating, the Woolino 4 Season Sleep Bag can be used year-round. It’s suitable for room temperature 63-75F (17-24C). Because of merino’s unique ability to regulate body temperature, it helps keep your baby warm when it's cold and cool when it's hot.
  • Grows with your baby 
    It is designed to fit kids 2 to 4 years old. For smaller children, adjust the fit by closing the underarm snaps.
  • Excellent value 
    It saves you buying a different sleep bag every few months. It’s the only sleep bag your toddler will need, in winter or summer, for 2 years.
  • Designed to be practical 
    It features double shoulder snaps and a two-way side zipper, so you can open it completely flat for easy dressing without waking the baby! For easy nighttime diaper changes, you can open the bottom only. Zipper-pull guards protect baby's skin and discourage child from chewing on the zipper pull.
  • Travel friendly 
    A closable seatbelt opening allows for easy transfer between stroller, car seat, and crib, so you can keep your baby’s sleep routine intact while on the go.
  • Replaces loose blankets
    Helps your child to stay covered through the night.


Machine wash on low (100°F max), use wool or mild detergent. Close zipper. Can be tumble dried on No Heat or Air Dry setting. Hang to dry whenever possible. To refresh and reduce washing, turn garment inside-out and air often.

We do not recommend sizing up. The sleep bag should be well-fitted around your child's upper body for a safe and secure fit. We suggest using our recommended sizing guidelines to find the correct size based on your child's age, height, and weight. Your baby should not be below the minimum recommended weight.

size chart for Woolino Ultimate, Woolino Basic, and Woolino Sleep Bags with Feet


  • Certifications 
    Made with Woolmark, Oeko-Tex 100, and RWS (Responsible Wool Standard) certified merino wool;  GOTS and Oeko-Tex 100 certified organic cotton;  Oeko-Tex 100 certified (tested for 100 harmful substances), nickel, lead, and phthalates free YKK snaps and zippers.


           Woolino_Responsible Wool Standard Certified_Logo             

  • Awards 
    #1 rated and #1 selling merino wool baby sleep bag in US and Canada and winner of 2021 Cribsie Award, Creative Child and Baby Maternity's 2012 & 2018 Top Choice of the Year Award, 2017 Eco Excellence Award, 2016 Green Scene Mom Award, and Mom's Choice Award.



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