Men’s silk underwear—and men’s silk panties in particular—is easiest to choose by cut and fit. Boxer briefs provide the most familiar coverage. String briefs use narrow sides and a low rise. T-back thongs minimize rear coverage and can reduce visible lines under fitted clothing.
The FEELITS men’s range was developed around different coverage preferences rather than one default shape. Customer feedback and market demand informed the inclusion of fuller boxer briefs, lighter string briefs, and minimal T-back styles.
For the FEELITS styles discussed in this guide, the main body fabric is 100% silk. Elastic waistbands and other functional construction components are separate from the silk body fabric and are used where needed for fit and structure. Check the individual product page and garment label for the exact composition of each style.
Silk has limited natural stretch compared with many underwear fabrics that contain more elastic fibers. Product-specific measurements matter, especially for low-rise cuts.
Compare Men’s Silk Underwear Styles
| Style | Construction and coverage | Consider it if you want |
|---|---|---|
| Boxer briefs | More fabric through the sides and back | A familiar, everyday underwear shape |
| String briefs | Low rise, narrow sides, moderate rear coverage | Less side bulk without moving to a thong |
| T-back thongs | Minimal rear coverage and a narrow T-back | A low-profile option under fitted clothing |
The fit will change across these styles even if the listed size is the same. A boxer brief distributes fabric across the leg and seat. A string brief narrows the side panels. A T-back removes most of the fabric at the back.
Boxer Briefs: A Familiar Everyday Shape
The FEELITS KNM03 Men’s Mulberry Silk Boxer Briefs are made from 100% 6A mulberry silk and are available in sizes M through XXL.
The product page lists a boxer-brief silhouette, soft elastic waistband, pouch design, and flat seams. This is a practical option for shoppers who already wear boxer briefs and want to try a silk version without changing to a minimal silhouette.
KNM03 has more coverage through the sides and back than the other two styles in this guide. That may suit daily wear, but it also means more fabric under close-fitting pants than a string brief or T-back thong.
The product page recommends sizing up for extra comfort. Use that guidance alongside the product’s waist and hip chart rather than treating it as a universal rule for all men’s silk underwear.
String Briefs: Low Rise, Narrow Sides, Practical Coverage
The FEELITS KNM06 Men’s Mulberry Silk String Briefs are low-rise string briefs with narrow sides, moderate rear coverage, and a double-layer pouch. The main body uses 100% 6A-grade mulberry silk.
KNM06 was developed as a lightweight string brief for everyday wear. Its low rise and narrow sides are intended to give men a lighter feel closer to a thong while retaining the practical rear coverage of a brief.
This makes KNM06 a middle-ground option. It has less fabric at the sides than a classic brief but more coverage than a T-back. It can suit shoppers looking for a lower-profile cut for fitted trousers, shorts, or lounge clothing.
The product page notes that elastic, stitching, and supporting components may use other materials. Refer to the garment label for the exact full composition.
How to Measure for a Low-Rise String Brief
KNM06 sizing needs one extra point of attention. Some shoppers measure at the narrowest part of the waist, then find a low-rise garment feels too small once it sits lower on the body.
Measure around the widest part of the waist where the waistband will actually sit, not only at the narrowest point of the torso. Then compare that measurement with the KNM06 size chart.
KNM06 is available in M through XL. The product page recommends sizing up if you are between sizes or prefer a less fitted result.
T-Back Thongs: Minimal Back Coverage
The FEELITS THM03 Men’s Mulberry Silk T-Back Thong is made from 100% 6A-grade mulberry silk and is available in M through XL.
It has a minimalist T-back and a double-layer pouch. The pouch provides front support and stability without making the minimal-cut style feel bulky.
THM03 is the lowest-coverage option in this guide. The product page positions it as a no-show style under fitted pants, shorts, activewear, or tailored clothing. That use case may appeal to shoppers who want less fabric at the back, but it will not suit everyone. Those who prefer fuller rear coverage may be more comfortable in a boxer brief or string brief.
The product page recommends choosing one size larger than usual for a more comfortable fit. Because this style has a different construction from a boxer brief, use the THM03 size chart rather than applying the sizing logic of another cut.
How Men’s Silk Underwear Should Fit
Use waist and hip measurements before selecting a size. Each of the three styles has its own chart:
- KNM03 is available in M through XXL.
- KNM06 is available in M through XL.
- THM03 is available in M through XL.
A well-fitting waistband should stay in place without digging in. The pouch should not pull across the front. Rear coverage should reflect the style you chose: a T-back will feel different from a boxer brief by design, not because it is automatically too small.
If you are between sizes, use the advice on the relevant product page. KNM03 recommends sizing up for extra comfort. KNM06 and THM03 recommend sizing up when you prefer a less fitted feel.
Choose by Coverage and Clothing
- Choose boxer briefs if you want the most familiar silhouette and fuller coverage through the sides and back.
- Choose string briefs if you prefer a low-rise waistband, narrow sides, and more rear coverage than a thong.
- Choose a T-back thong if you want minimal rear coverage and a lower-profile option under fitted clothing.
For travel, start with the style you already know you can wear comfortably.
Care for Men’s Silk Underwear
The care guidance for KNM03, KNM06, and THM03 is consistent:
- Hand wash gently in water below 95°F / 35°C.
- Use a silk-friendly detergent.
- Avoid bleach and harsh cleaning agents.
- Do not scrub, twist, wring, or tumble dry.
- Air dry away from direct sunlight.
Follow the garment label if it differs from the product page, particularly where elastic or other support components are present. For step-by-step washing guidance, see the silk care guide.
Frequently Asked Questions
What is the difference between men’s silk boxer briefs, string briefs, and thongs?
Boxer briefs have the most overall coverage. String briefs use narrow sides and moderate rear coverage. T-back thongs have minimal rear coverage and a narrower back construction.
Which men’s silk underwear style is best for first-time buyers?
Start with the cut closest to what you already wear. Boxer briefs are the most familiar style in this guide. String briefs are a lower-coverage step between boxer briefs and thongs.
How should I wash men’s silk underwear?
Hand wash gently in water below 95°F / 35°C with a silk-friendly detergent. Avoid bleach, twisting, tumble drying, and direct sunlight. See the silk care guide for full instructions.
Should I size up in men’s silk underwear?
Check the product-specific guidance. KNM03 recommends sizing up for extra comfort. KNM06 and THM03 recommend sizing up if you are between sizes or prefer a less fitted feel.
Can I use the same size across boxer briefs, string briefs, and thongs?
Not reliably. The cuts use different coverage, rises, and measurement ranges. Review the size chart for each product rather than assuming one size applies across all styles.
