Contact Us (800) 966-5540

Woolino 4 Season Baby Sleep Bag



The Woolino 4 Season Baby Sleep Bag is 100% natural, fully machine-washable, and an excellent value, as it comes in one universal size that fits babies from 2 months to 2 years. Wool’s ability to regulate temperature means there’s no need to worry about whether your baby will be too hot or cold while sleeping—they’ll always be just right!


Earn up to 1,100 Dream Points.


The Woolino Ultimate 4 Season Baby Sleep Bags are designed so that you need only one—regardless of the season, regardless of your baby’s age. How is this possible?

The merino wool used is supremely breathable, keeping your baby warm when it’s cold and cool when it’s hot. That temperature regulation means that your baby will sleep comfortably throughout the night, year-round, and that means a better night’s sleep for you too.

Our universal sizing means that it will fit a baby from 2 months to 2 years. This consistency in sleepwear will allow your baby to always associate the comfort of their sleep bag with a good night’s sleep.

So, instead of buying a different sleep bag for different seasons, as well as buying larger ones as they grow, you just need one Woolino sleep bag for your baby.

  • 100% Natural
    Pure silky-soft hypoallergenic merino wool lining and the finest organic cotton outer.
  • 4 Season use
    Unlike other brand sleep bags or 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 63-77F (17-25C). 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 has a universal size so it can be used for babies 2 months up to 2 years old. And for smaller babies, simply close the underarm snaps to adjust the fit.
  • Excellent value
    With Woolino Ultimate 4 Season Sleep Bag, you don’t have to buy a different baby sleeping sack every few months. It is the only baby sleep bag your baby will need, in winter or summer, until they turn two years old.
  • Designed to be practical
    It features double shoulder snaps and a two-way side zipper, so it opens up completely flat for easy dressing without waking the baby! For easy nighttime diaper changes, you can open the bottom only. It also has zipper-pull guards to protect baby’s skin and to discourage them from chewing on the zipper pull.
  • Travel friendly
    A closable seat-belt 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.
  • Easy care
    In addition to Merino being naturally anti-bacterial and odor repellent, Woolino sleeping bags are machine washable and can be tumble dried on ‘no heat’ setting.
  • It is a safer alternative to loose blankets
    Helps your baby stay covered through the night and replaces loose blankets in the crib that can cover your baby’s face and interfere with breathing. The sleeping bag also promotes back sleeping.
  • Naturally fire resistant
    Wool is a natural flame retardant and the best fiber to have next to your baby’s body. Woolino sleep bags meet all US CPSC children safety requirements.
  • Certifications
    Woolino 4 Season Sleep Bags are made with Woolmark and Oeko-Tex 100 certified merino wool and GOTS and Oeko-Tex 100 certified organic cotton. There is no nickel, lead and phthalates in the YKK snaps and zippers, which are also Oeko-Tex 100 certified.

Care Instructions

  • It is not necessary to wash your Woolino garments prior to use
  • WE SUGGEST MACHINE WASH: Close all zippers. Use gentle wool cycle, on LOW temperature, 100°F /40°C max. Gentle spin.
  • If hand wash: Gently soak and squish in lukewarm water. Do not agitate, wring or rub wool against wool.
  • Use wool approved detergent – we recommend Eucalan, a plant based alternative to “traditional” detergents.
  • Do not soak or bleach.
  • Avoid fabric conditioners and softeners.
  • Use minimal amount of detergent as it can increase felting and pilling over time.
  • Sleeping bags can be tumble dried on “NO Heat” setting. Close zipper before tumble drying. Dry flat whenever possible. Keep away from direct sunlight or any direct heat source (radiator). Do not tumble dry blankets and clothing.
  • Cool iron on outer cotton only. Do not iron prints or labels.

Pilling – How to prevent it

Pilling is a natural process that is inherent in merino fabric due to the fact that merino is a staple fiber. Generally, pilling occurs because the shorter fibers are working their way to the surface of the fabric.

The best way to avoid pilling is to wash a new merino wool product after the first couple of wears. The pilling will diminish over time as non-tenacious wool fibers work themselves free of the fabric and break away.

Customer Reviews

Based on 1 review
Robin K.
Safe and Pure Baby Sleep Blanket

This is the only blanket my two sons slept in from Newborn to "Mama-I-want-to-wear-my-T-Rex-costume-to-bed" stage. We live in Southern Oregon where all four seasons reign (and rain) so the Woolino is perfectly named. It was in such good conditions despite being very well worn after several years of use that when I gifted it to a friend she was doubtful it was even used. Beautiful, high quality heirloom product, just like Shepherd's Dream!