Reiff · Organic Cotton Sleep Sack
Baby Sleeveless Wearable Blanket, 100% Organic Cotton Fleece
German-made cotton fleece sleep sack with front zip for easy diaper changes. Soft, breathable, and machine washable—a simple alternative to wool for warm-weather sleep and sensitive skin.
Reiff is a third-generation family business founded in 1939 in Göttingen, Germany. The company began producing baby jackets and bonnets in bleached cotton, and has since become known for carefully designed wool and organic cotton apparel manufactured entirely in Germany. In 2002, siblings Axel and Andrea Reiff took over the business and shifted exclusively to organic textiles, holding GOTS and IVN Best certification for all yarns and finished goods. Every piece is made on Reiff's own premises or within 50 km of the factory—a commitment to traceability and quality that defines the brand.
When to Use This Wearable Blanket
This sleeveless cotton fleece wearable blanket is designed for mild to warm weather, or as a lightweight layer in transitional seasons. Organic cotton fleece is breathable and naturally regulates moisture, making it ideal for babies and toddlers who sleep warm or have sensitive skin. Unlike wool sleep sacks, which trap heat and work best in cold months, this cotton fleece piece is best suited for spring, summer, and early fall, or for use indoors year-round in heated homes.
The sleeveless cut allows maximum breathability and pairs well with a light pajama top underneath if additional warmth is needed. The front zip makes nighttime diaper changes quick and easy without disturbing your baby's sleep.
Age range: Newborn to 2 years (sizing available from EU50-56 through EU98-104)
Materials & Construction
Fiber Composition
100% organic cotton fleece. This is cotton that has been knitted into a base fabric, then brushed to create a soft, plush pile on both sides. The result is lightweight yet warm, with excellent breathability.
Certification
GOTS (Global Organic Textile Standard) certified. GOTS is the leading worldwide standard for organic textiles, covering both organic fiber farming and the entire processing chain including dyes and finishes. All Reiff cotton products are certified to GOTS standards.
Manufacture
Made in Germany. Reiff manufactures all apparel on-site or within 50 kilometers of its factory in Göttingen, Germany, ensuring quality control and traceability at every step.
Design Features
Sleeveless cut for maximum breathability. Front zip closure allows for quick diaper changes without removing the blanket. Available in multiple sizes for newborn through 2-year-old toddlers.
Key Features
Breathable & Temperature-Regulating
Organic cotton fleece is naturally breathable and wicks moisture away from skin, helping to prevent overheating during sleep. Ideal for babies who run warm or sleep in warm rooms.
Easy to Care For
Machine washable in cold or warm water with like colors. No special wool wash required, no hand washing needed—cotton is far simpler to maintain than merino or boiled wool.
Soft on Sensitive Skin
GOTS-certified organic cotton means no synthetic pesticides, harsh dyes, or chemical finishes. A gentle, chemical-free choice for babies with eczema or sensitive skin.
Practical Front Zip
Sleeveless design with front zipper allows you to change diapers without removing the sleep sack, minimizing sleep disruption for your baby.
Sizing Guide
Reiff sizes are based on European measurements (height in centimeters). European sizing runs slightly slim—if your child is at the upper end of an age range or is tall for their age, consider sizing up. The chart below shows the age estimate and corresponding height range for each size.
| EU Size |
Age Range |
Height |
Body Circumference |
| 50/56 |
0–2 months |
50–56 cm (20–22 in) |
50–56 cm |
| 62/68 |
3–6 months |
57–68 cm (22–27 in) |
57–68 cm |
| 74/80 |
7–12 months |
69–80 cm (27–31 in) |
69–80 cm |
| 86/92 |
13–24 months |
81–92 cm (32–36 in) |
81–92 cm |
| 98/104 |
18–24 months |
93–104 cm (37–41 in) |
93–104 cm |
Honest Assessment
Best For
This wearable blanket is ideal for parents who prefer the simplicity of cotton care, babies who sleep warm, warm-weather seasons, and children with sensitive or eczema-prone skin. If your home runs cool year-round or you live in a cold climate, a wool or wool-blend sleep sack will provide more insulation. This piece is not a substitute for a thermal sleep sack in winter.
Trade-Offs vs. Wool
Cotton fleece is less thermally efficient than wool at equivalent weight—it doesn't trap air and regulate temperature in the same way merino or boiled wool does. However, cotton is easier to wash (machine washable, no special detergent), dries faster, and is simpler for parents managing frequent laundry. Cotton fleece is also ideal for babies who prefer a non-wool sleep surface or who live in warmer climates. The trade-off is warmth for convenience and suitability.
Investment & Longevity
This piece will last for multiple children if well cared for. Organic cotton softens and improves with each wash, becoming more comfortable over time. The GOTS certification and German manufacturing ensure durability and quality that justifies the heritage brand price. Many Reiff pieces are passed along within families, making them a practical long-term investment despite upfront cost.
Care Instructions
Machine wash cold or warm Like colors No bleach Tumble dry low or air dry
Machine wash in cold or warm water with like colors. Organic cotton can be machine washed without special detergent, though a gentle, eco-friendly laundry soap is ideal. Avoid fabric softeners—they coat the fibers and reduce breathability over time. Do not bleach. Tumble dry on low heat or air dry. Unlike wool, cotton actually improves with washing and gets softer with age. Frequent washing is perfectly safe and won't damage the fabric.
Cotton fleece is naturally resistant to odor and does not require frequent washing. If your baby has only had minor spit-up or light use, airing the piece outside for a few hours often refreshes it without a full wash. When washing is needed, keep it simple—your washing machine will handle the work.
Frequently Asked Questions
Is this suitable for babies with sensitive skin or eczema?
Yes. GOTS-certified organic cotton means the fiber is grown without synthetic pesticides and processed without harsh dyes, bleaches, or chemical finishes. Many parents of babies with eczema choose organic cotton specifically because it eliminates chemical exposure. That said, each baby is unique—if your child has reacted to cotton in the past, consult your pediatrician before purchasing.
How is this different from a wool sleep sack?
Cotton fleece is lighter and more breathable than wool, making it better for warm weather and babies who sleep hot. It's also much easier to care for—machine washable with any gentle detergent, no special wool wash needed. Wool is more thermally efficient and better for cold weather. If you're choosing between the two, consider your climate and your baby's sleep temperature. Many families own both: wool for winter, cotton for summer.
Can I use this year-round?
In most climates, this cotton fleece piece is best used in warm weather (spring through early fall) or year-round in homes that are heated to 72°F (22°C) or higher. In cold climates or during winter months when homes are cooler, a wool sleep sack will provide better insulation. If you're unsure about temperature suitability, check the nighttime room temperature and adjust layering accordingly—this piece can work year-round if paired with warmer pajamas underneath in cooler months.
How should I wash it the first time?
Wash before the first use. Machine wash in cold or warm water with a gentle detergent (wool wash or standard eco-friendly laundry soap both work). Wash with like colors to avoid dye transfer from new garments. Tumble dry on low or air dry. Don't be alarmed if there's some lint in the dryer—this is normal for cotton fleece and does not affect the piece's durability.
What's the front zip for?
The front zip allows you to change your baby's diaper without removing the entire sleep sack. This means less sleep disruption for your baby and less work for you during nighttime changes. Simply unzip, change the diaper, and zip back up—your baby stays wrapped and warm.
Will it shrink?
Organic cotton has a slight shrinkage risk (typically 3–5%) if washed in hot water and tumble dried on high heat. To minimize shrinkage, wash in cold or warm water (not hot) and tumble dry on low or air dry. If you follow these guidelines, shrinkage will be minimal. Reiff's sizing accounts for typical shrinkage expectations, so washing as recommended should result in a good fit.
Is Reiff organic cotton Fair Trade certified?
Reiff products carry GOTS (Global Organic Textile Standard) and IVN Best certification, which cover organic farming practices and the entire supply chain. GOTS does not include Fair Trade certification, but IVN Best includes strict labor and environmental standards. If Fair Trade certification is important to you, Sense Organics is another EcoAble brand that carries both GOTS and Fair Wear Foundation certification. Feel free to reach out if you have questions about specific certifications.
