Reiff · Merino Wool & Silk Wearable Blanket
Sleep Sack with Sleeves — 1.0 TOG
German-made temperature-regulating sleep sack in 70% organic merino wool and 30% silk. Two-way zipper for easy diaper changes. Ideal for mild to moderate seasons (64–75°F).
About Reiff
Reiff is a third-generation German textile company founded in 1939 by Adolph Reiff. Today, under the leadership of Axel and Andrea Reiff (since 2002), the company is exclusively committed to organic textiles. Every Reiff sleep sack is made in Germany or the EU from Patagonian merino wool certified under kbT (controlled organic livestock farming) and mulesing-free sourced. The brand's commitment to quality, transparency, and ecological responsibility has made Reiff a trusted choice among European parents seeking natural-fiber sleep solutions.
Use & Season Guide
For Mild-to-Moderate Seasons Year-Round
This wearable blanket is designed as a standalone sleep garment for babies and toddlers in rooms between 18–24°C (64–75°F). The long sleeves provide modest warmth without bulk, making it an excellent choice for spring, fall, and mild winter nights. Parents in variable climates often layer this sleep sack over a thin base layer during colder months, or use it solo during temperate seasons. The 1.0 TOG rating reflects the breathable, midweight nature of the wool-silk blend.
European-Made Merino, Not Australian
Reiff sources merino fiber from certified organic farms in Patagonia but processes, spins, and knits every piece in Germany. This "Made in Germany" designation means superior quality control and lower environmental footprint compared to overseas manufacturing.
Fiber & Making
Materials & Construction
Fiber Blend
70% organic merino wool, 30% silk. The silk refines the wool's hand, creating a softer, smoother feel against delicate skin without sacrificing wool's natural temperature regulation.
Knit Structure
Interlock knit with terry loops on the inside (facing baby), creating an insulating air cushion. Smooth face on outside for durability. GSM not specified by manufacturer.
Certifications
kbT (controlled organic livestock farming), GOTS (organic fiber and processing), IVN certified. Mulesing-free sourcing verified. No synthetic dyes, no fire retardants, no chemical finishes.
Country of Origin
Designed, knitted, and finished in Germany. Merino fiber sourced from certified organic farms in Patagonia (South America). Manufacturing within EU/Germany maintains consistent quality and sustainability standards.
What Silk Adds to Merino
Silk naturally refines wool by softening the fiber hand and adding a subtle sheen. For sensitive-skinned babies, this 30% silk addition is often the difference between comfortable all-night wear and needing a base layer underneath. The wool and silk fibers work synergistically for temperature regulation and moisture management.
Warmth & Temperature
1.0 TOG — Mild to Moderate Seasons
1.0 TOG
This Sleep Sack
Ideal for room temperatures 18–24°C (64–75°F). Lightweight enough for spring and fall; layers well over a base layer in winter.
How TOG Works
Warmth Rating
TOG measures thermal resistance. 1.0 TOG is lighter than 2.5 or 3.5 TOG sleep sacks but warmer than bare sleeping. Merino's temperature regulation means your baby stays comfortable without overheating.
Layering Guide
Cold Nights
Below 18°C, pair with a thin merino or wool base layer underneath. Above 24°C, use as a standalone sleep garment or consider transitioning to a cotton sleep sack.
What Sets It Apart
Key Features
Two-Way Full-Length Zipper
Zips from foot to shoulder in both directions, enabling diaper changes without unzipping the entire sack or waking your child. Quality metal zipper with child-safe stops.
Long Sleeves
Full-length sleeves provide modest warmth and arm coverage, reducing the need for swaddles or blankets. No safety concerns with arms covered.
Temperature Regulation
Merino wool naturally regulates body heat — absorbs moisture when baby is warm, releases it when baby cools. Silk enhances breathability and softness without sacrificing regulation.
Gentle for Sensitive Skin
Fine merino (micron count typically 17–19 for sleep garments) is soft enough for most babies and young toddlers. Silk refinement makes this option especially suitable for eczema-prone or reactive skin.
No Chemical Finishes
GOTS and IVN certified, meaning no synthetic dyes, flame retardants, azo dyes, or harmful chemicals. Processed according to strict ecological and labor standards.
Durability & Hand-me-Down Ready
Quality German construction and premium merino fiber withstand hundreds of gentle washes. Many families pass these sleep sacks between siblings or friends, making the long-term value exceptional.
Get the Right Fit
Sizing & Fit Guidance
Reiff sizes by age and height. European sizing runs slightly slim — if your child is at the upper end of an age range or tall for their age, size up. Measure your child's height in centimeters and match to the chart below.
| EU 62–68 |
3–6 months |
62–68 cm / 24–27 in |
55 cm / 21.5 in |
| EU 74–80 |
6–12 months |
74–80 cm / 29–31 in |
69 cm / 27 in |
| EU 86–92 |
12–18 months |
86–92 cm / 34–36 in |
76 cm / 30 in |
| EU 98–104 |
18–24 months |
98–104 cm / 38–41 in |
86 cm / 34 in |
| EU 116 |
2–4 years |
116 cm / 45 in |
118 cm / 46 in |
Sizing Up: When & Why
If your 12-month-old is already 88 cm tall, move to EU 98–104. A sleep sack that's too small restricts movement and negates the temperature-regulating benefits. Too large is safer than too small. The zipper and arm length will still fit and provide comfort as your child grows.
Be Clear-Eyed
Honest Assessment
Best For
Babies and toddlers (3 months–4 years) in mild-to-moderate climate zones or during spring/fall/early-winter seasons. Ideal for parents seeking a natural-fiber sleep solution with no synthetic dyes or chemical finishes. Excellent for families planning to pass the sleep sack between siblings, as quality justifies the cost over time. Also well-suited for babies with sensitive skin or eczema, though individual reactions vary.
Trade-Offs to Know
Wool sensitivity: A small percentage of children react to wool despite fine micron counts. If your child has reacted to wool in the past, start with the wool/silk blend worn over a thin base layer, or consider a pure organic cotton sleep sack. Care commitment: Wool requires cold-water hand or delicate machine washing and air drying. Correct care extends the lifespan; incorrect care (hot water, tumble dryer) will felt and shrink the fabric permanently. Price: German manufacturing and organic certification justify the cost, but these sleep sacks are not budget-friendly. TOG range: At 1.0 TOG, this piece is not suitable for very cold climates (below 16°C) or very warm ones (above 24°C) without layering or transitioning to different garments.
Care Commitment
Wool is low-maintenance once you establish the routine: hand wash or delicate machine cycle in cold water with wool-specific detergent, lay flat to dry away from direct heat. Wool naturally resists odor and rarely requires washing — airing between sleeps often suffices. With proper care, these sleep sacks regularly outlast the children who wear them.
Keep It Beautiful
Care Instructions
Wash below 30°C Wool wash detergent Lay flat to dry No bleach No tumble dry Hand wash recommended
Hand washing (recommended): Fill a basin with cool water (below 30°C / 86°F) and add a gentle wool-specific detergent such as Eucalan or Sonett wool wash. Submerge the sleep sack and gently agitate for 5 minutes. Rinse in cool water until detergent is gone. Gently press water out — never wring or twist the fabric. Lay flat on a clean towel away from direct heat and sunlight to air dry.
Machine washing (delicate cycle only): Use a wool or delicate cycle on your washing machine with cold water only. Use wool-specific detergent. Set spin speed to no more than 400 revolutions per minute. Place the sleep sack in a mesh laundry bag for protection. Do not use hot water, and do not exceed 30°C under any circumstances.
Drying: Lay flat on a clean, dry towel. Reshape gently while damp. Never tumble dry, hang, or expose to direct heat or sunlight. Air drying takes 24–48 hours depending on humidity.
Washing frequency: Wool naturally resists odor and bacteria. Most families wash these sleep sacks every 2–3 weeks or less frequently. Spot-clean small stains with a damp cloth and gentle detergent. Airing between uses often refreshes the fabric without need for full washing.
Why Cold Water?
Hot water or agitation causes wool fibers to relax and felt together, permanently shrinking and hardening the fabric. Cold-water washing keeps fibers intact and preserves the soft hand and shape of the garment for years of use.
Questions
Frequently Asked
Is this sleep sack itchy or uncomfortable?
Fine merino wool at 17–19 microns is soft enough for most babies and sensitive-skinned adults. The 30% silk content makes this blend even smoother than pure merino. However, a small percentage of children are sensitive to wool regardless of fineness. If your child has reacted to wool before, test this over a thin base layer first, or opt for a pure organic cotton sleep sack. For babies new to wool, the majority adapt quickly.
What does 1.0 TOG mean, and will my baby be warm enough?
TOG measures thermal resistance. 1.0 TOG is appropriate for rooms between 18–24°C (64–75°F). This covers spring, fall, and mild-winter nights in most temperate climates. In colder months (below 18°C), layer this sleep sack over a thin merino or cotton base layer. Merino wool's temperature-regulating properties mean your baby won't overheat, even when layered. If your room stays above 24°C year-round, this may be too warm — consider a lighter cotton option.
How often do I need to wash this?
Wool naturally resists odor and bacteria. Most families wash these sleep sacks every 2–3 weeks. Spot-clean minor stains, and simply air the garment between uses — no full wash needed. Washing less frequently extends the garment's lifespan.
What if I accidentally wash it in hot water or the dryer?
Unfortunately, hot water or tumble drying will cause the wool to felt and shrink permanently. The fibers relax and bind together, hardening the fabric and reducing it by 10–30% depending on the temperature. To avoid this, always use cold water and air dry flat. If this happens, the sleep sack cannot be restored.
What do the certifications (kbT, GOTS, IVN) mean?
kbT (kontrolliert biologische Tierhaltung): German standard for organic livestock farming. Merino sheep are raised on certified organic pasture, with no synthetic pesticides, antibiotics, or hormone treatments. Mulesing is prohibited. GOTS (Global Organic Textile Standard): Certifies both organic fiber and processing, including dyeing and finishing. No synthetic dyes, no flame retardants, no azo dyes. IVN (Internationale Verband der Naturstoffindustrie): EU certification covering even stricter standards than GOTS, including stricter chemical restrictions and environmental impact. Reiff holds all three, meaning every step from farm to finished garment meets rigorous ecological and social standards.
Why should I pay this much for a sleep sack?
German manufacturing, certified organic fiber, and premium merino/silk blend justify the cost. These sleep sacks are built to last through multiple children and years of regular washing. Many families pass them between siblings or friends, making the long-term cost per use very reasonable. You're paying for quality, durability, transparency, and the peace of mind that comes with GOTS and kbT certification — no guessing about what chemicals or pesticides were used.
What size should I order if my baby is tall for their age?
Size up. European sizing runs slightly slim, and a sleep sack that's too small restricts movement and reduces effectiveness. If your child is within 2–3 cm of the upper end of a size range, go to the next size up. The arm length and zipper will still function properly, and your child will have room to grow. Too large is safer than too small.
