Products
Underwear Adjustment Fastener
1. The durable and multi-functional metal nylon-coated material bra alloy rings and sliders are suitable for bras, underwear and swimwear.
2. The underwear adjustment fastener are the core components for adjusting the tightness of the shoulder straps or back of the underwear, and the adhesive layer on the surface distinguishes them from ordinary metal clasps and is a key design.
3. The adjustment clasps for underwear are divided into two types: metal base and plastic base.
a) Metal base: mostly made of copper, stainless steel or alloys. The advantage is high strength, not prone to deformation, and can withstand pulling for a long time, suitable for bras that require strong support (such as sports bras, large-breast bras).
b) Plastic base: mainly made of nylon and PP (polypropylene). The characteristics are light weight, low cost, and good flexibility, suitable for underwear that pursues a light feeling (such as sleepwear, no-stitch bra).
4. The adhesive adjustment clasps for underwear are closely combined with the base through the "plastic injection molding with adhesive" process, with no obvious gaps.
Features
1. Precise adjustment of tightness: With a multi-level design, the bra can be flexibly adjusted to the chest shape, underbust size or weight changes, avoiding overly tight skin compression or overly loose cup slipping.
2. Prevent sliding and shifting: The underwear adjustment fastener can increase the friction with the clothing fabric, effectively preventing the shoulder straps from sliding during wearing, reducing the hassle of frequent adjustments.
3. Enhance wearing comfort: The soft texture of the rubber layer can buffer the cold and hard feeling of the metal buckle when in direct contact with the skin, reducing friction and pressure on the skin.
Advantages of underwear adjustment fastener

Excellent anti-slip properties, no tendency to fall off
- The surface of the rubber layer (mainly made of silicone or TPU) has a much higher friction force than metal or plastic materials, allowing it to firmly adhere to the shoulder strap fabric or the skin, reducing the risk of the shoulder strap slipping and the adjustment buckle shifting.
- Its advantages are more obvious in sports scenarios. Even with significant movements, the rubber layer can remain fixed, preventing the underwear from affecting the supporting effect due to shifting.
High comfort: Reduces skin pressure
The underwear adjustment fastener for soft texture of the rubber layer can cushion the direct contact of the hard base (metal, plastic) with the skin, enhancing the wearing experience.
- Avoid the cold feeling of metal clasps, especially in autumn and winter, there will be no obvious temperature difference stimulation when touching the skin.
- The rubber layer can disperse pressure, reducing the friction and soreness on the skin of the shoulder and back caused by the edge of the adjustment buckle, and it is not prone to causing discomfort even after long-term wearing.


Skin-friendly: Suitable for more people
The characteristics of the molded rubber material make it more friendly to the skin and have a wider application range.
- Main molded rubber materials (such as food-grade silicone, medical-grade TPU) have strong chemical stability and do not release irritating substances, reducing the risk of allergic reactions for sensitive skin groups.
- The surface of the rubber layer is smooth without burrs, and it will not catch the fabric of the clothing or rub against the skin, suitable for common soft fabrics of underwear (such as cotton, modal).
Durability: Balancing function and lifespan
The rubber layer not only enhances the experience but also protects the adjustment buckle body, extending the lifespan.
- •The rubber layer can isolate the corrosion of sweat and detergents on the metal base, avoiding rusting of metal or aging of plastic, especially suitable for underwear that is frequently washed.
- • High-quality rubber layers (such as TPU) are wear-resistant and crack-resistant. Even after long-term pulling or adjustment, there is no situation of rubber layer detachment or deformation, maintaining stable performance.

Products Parameters
|
Product Name |
underwear adjustment fastener |
|
Material |
Nylon, zinc alloy, iron alloy, plastic |
|
Shape |
Circular, square, oval |
| Features |
1>. Rust-free, resistant to salt water, resistant to chlorine. 2>. Free of nickel and lead, resistant to salt water and chlorine. |
|
Place of Origin |
China |
|
Product Type |
Breast hook and eye fastener |
|
Design |
Environmentally friendly, easy to wash, durable |
|
Use |
Yoga clothes, evening gowns, wedding gowns, bras, underwear, swimming suits, sports bras |
|
MOQ |
500pcs |
|
Color |
Silver, gold, black, rose gold and custom |
Why Choose Us?
Wide Market
Our customers are mainly from Europe,America, Japan, Germany, Saudi Arabia and other countries, OEM ODM is very welcome.
Rich Experience
Shenzhen Jianuo Fashion Co.. Ltd, Founded in 2013 and headquartered in Longgang,Shenzhen.Our company focuses on accessories for 12 years.
Strong Production Capacity
We have established a mature online and offline integrated sales system. As a comprehensive service provider integrating R&D, production and sales, we have our own craftsmanship and hardware casting production factories,and have a professional production base.
Wide Range of Applications
Our main products are bra rings and sliders, bra clasps, bra steel rings, bra hooks and eyes, bra bones and clothing pendants.
FAQ
Q: How to choose the right type of gel-covered adjustment fasteners for different types of underwear?
A: 1. Silicone gel-covered adjustment fasteners: These are recommended for sports bras, large-breast bras, or people whose shoulder straps tend to slip. The silicone's strong friction can firmly fix the shoulder straps or back clasps, preventing them from shifting during movement; it is also highly flexible, making contact with the skin without any foreign sensation, and is suitable for scenarios requiring strong anti-slip properties.
2. TPU (Thermoplastic Polyurethane) underwear adjustment fastener: These are suitable for daily commuting bras and people with sensitive skin. The TPU coating is wear-resistant and has good elasticity, and it is unlikely to crack over time; its skin-friendly properties are better than ordinary plastics, and it is lighter and thinner than silicone, thus not causing additional burden to the shoulders or back, and suitable for frequent daily wear.
3. Thin gel layer adjustment fasteners: These are recommended for bras without steel rings and sleep bras. These fasteners have a thinner gel layer, focusing on "lightweighting", and when paired with the soft fabric of the bra, they can minimize the feeling of restraint while retaining the basic anti-slip effect, making them suitable for scenarios that prioritize ultimate comfort.
Q: Which types of underwear are suitable for gel-covered adjustment fasteners?
A: 1. Sports bras: These are the core type for gel-covered adjustment fasteners. During intense movements, the shoulder straps are prone to slipping and the back clasps to shifting, and the strong friction of the gel layer (especially silicone material) can firmly fix the position, while the softness of the gel layer can buffer the friction during movement, preventing skin damage.
2. Daily commuting bras: They are highly adaptable. Daily wear requires maintaining comfort for a long time, and the gel layer can avoid the cold feeling of metal clasps and the roughness of hard plastic, and the basic anti-slip property can reduce the awkwardness of frequently adjusting the shoulder straps during commuting, suitable for common fabrics such as cotton and modal.
3. Large-breast reducing / support bras: These are very suitable. These bras need stronger support, and the underwear adjustment fastener is subjected to greater force, and the gel layer can disperse the pressure, avoiding the edge of the adjustment fastener from causing compression and marks on the shoulders or back, while the anti-slip performance ensures that the adjustment position does not shift.
4. No steel ring / sleep bras: They have a high adaptability. No steel ring bras focus on lightness and comfort, and the gel-covered adjustment fasteners (especially the thin gel layer type) are lightweight and have no foreign sensation, while retaining the basic adjustment function and not disrupting the relaxation state during sleep, avoiding skin sensitivity and discomfort.
5. Nursing bras: They have strong adaptability. During nursing, frequent wearing and adjustment are required, and the smooth surface of the gel-covered adjustment fasteners does not easily catch clothes, and the skin-friendly material can reduce irritation to the sensitive skin after childbirth, and the anti-slip property ensures the stability of the bra position during breastfeeding.
Q: What are the precautions for using the rubberized adjustment?
A: 1. Avoid violent pulling: When adjusting, use gentle force to prevent the rubberized layer from falling off due to excessive pressure, or the shoulder strap fabric from being scratched by the fastener.
2. Check after washing: After washing the underwear in the machine or by hand, check if the rubberized layer of the adjustment buckle has any cracks or deformations. If there is any damage, replace it immediately to avoid affecting the anti-slip and fixation effect.
3. Suitable for sensitive skin: When using new underwear for the first time, you can first place the rubberized layer of the adjustment buckle against your skin for 5 minutes to confirm if there are any allergic reactions such as itching or redness. Then, you can wear it normally.
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