Types of Weft Hair Extensions: Machine, Hand-Tied & Flat Wefts ExplainedUpdated 18 hours ago
If you have been researching sew-in hair extensions, you may have seen terms such as machine weft, hand-tied weft, and flat or seamless weft. These terms describe how the extension hair is constructed along the top track of the weft.
Although all three constructions are designed to hold extension hair together in a continuous track, the thickness, flexibility, durability, and way the track is handled during installation can differ.
Shopping SL Raw?
SL Raw Virgin Hair currently offers machine-wefted human hair bundles. The hand-tied and flat-weft information below is included to help you understand the terminology you may encounter while researching hair extensions.
What Does Weft Construction Mean?
A weft is the continuous track that holds extension hair together. Weft construction refers to the way the strands are secured along the top of that track.
This is different from a bundle, which is the amount of weft hair you purchase, and a sew-in, which is an installation method used to attach the weft to a prepared braid foundation.
New to those terms? Start with What Are Weft Hair Extensions?
1. Machine-Wefted Hair
Example of machine-weft construction with a reinforced stitched track
Machine-wefted hair is created by using a sewing machine to secure the extension strands together along the top of the track. This produces a reinforced weft that can be handled and positioned by a professional stylist during a sew-in installation.
Common characteristics include:
- A reinforced stitched track
- Durable construction designed for professional sew-in use
- Suitable for partial or full sew-in installations
- Can also be used when constructing custom wigs or units
What SL Raw sells:
Our current human hair bundles use machine-weft construction. Your stylist can customize the number of tracks, placement, and amount of hair according to your desired sew-in result.
2. Hand-Tied Wefts
Example of a thinner hand-tied weft construction
Hand-tied wefts are constructed by securing the extension hair along the track by hand rather than using the same machine-stitching process used for a traditional machine weft.
They are generally known for:
- A thinner track construction
- Greater flexibility along the weft
- A flatter profile when appropriately installed
- Installation requirements that should be evaluated by a stylist experienced with that particular weft construction
Important: SL Raw Virgin Hair does not currently sell hand-tied wefts. This information is provided to help you compare terminology while researching extension options.
3. Flat or Seamless Wefts
Example of flat or seamless weft construction with a flatter upper track
Flat wefts, sometimes marketed as seamless wefts, use a flatter upper track than a traditional machine weft. Their construction is designed to reduce some of the bulk along the top of the weft.
Depending on the manufacturer, characteristics may include:
- A thinner or flatter upper track
- Reduced bulk compared with some traditional machine-weft constructions
- Flexibility for selected professional installation techniques
- Construction and installation requirements that can vary by manufacturer
Important: SL Raw Virgin Hair does not currently sell flat or seamless wefts. This article includes them so you can understand how they differ from the machine-wefted bundles we offer.
Machine vs. Hand-Tied vs. Flat Wefts: Quick Comparison
The main difference is the construction of the track itself.
Machine Weft
Reinforced machine-stitched track designed for durability and professional sew-in installations. This is the construction currently offered by SL Raw Virgin Hair.
Hand-Tied Weft
A thinner, flexible track created through hand-tied construction. Installation should follow the recommendations for the specific weft being used.
Flat or Seamless Weft
A flatter track designed to reduce bulk along the upper portion of the weft. Construction details may differ among manufacturers.
Which Type of Weft Should You Choose?
Weft construction is only one part of choosing hair extensions. The right option also depends on your natural hair, desired fullness, installation method, maintenance preferences, stylist’s experience, and the quality of the extension hair itself.
If you are considering a sew-in, talk with your stylist about the construction they prefer to work with and whether your natural hair can comfortably support the planned braid foundation and amount of extension hair.
Which Weft Construction Does SL Raw Virgin Hair Offer?
SL Raw Virgin Hair currently offers machine-wefted human hair bundles for sew-in installations and custom units.
Our collection includes multiple textures so you can select the finished look that best supports your natural hair, styling preferences, and installation goals.
Explore Machine-Wefted Human Hair Bundles
Still Learning About Weft Hair Extensions?
If you want to learn how bundles, wefts, and sew-ins work together, who may be a good candidate, how many bundles you may need, and what real sew-in results can look like, continue with our beginner weft guide.