TENCEL™ Modal 4.5" Trunks vs 6" Boxer Briefs: Which Suits You?
By tomboyx | Premium Underwear for All Day Comfort. Fit for You. | Published: 2026-10-30
Category: Comparisons
Comparing TomboyX's TENCEL™ Modal 4.5" Trunks and 6" No Fly Boxer Briefs: find out which cut and fabric blend works best for your daily comfort and style.
Quick answer
For a barely-there, stretchy feel with a shorter inseam, choose the TENCEL™ Modal 4.5" Trunks. If you prefer a cotton-soft, slightly longer cut without a fly, the 6" No Fly Boxer Briefs are your pick.
Fabric and feel: TENCEL™ Modal vs cotton blend
The 4.5" Trunks use TENCEL™ Modal, a sustainably sourced fabric from beechwood trees. It's highly stretchy and designed to feel like wearing nothing—ideal for hot days or sensitive skin.
The 6" No Fly Boxer Briefs use a supersoft cotton blend with just a hint of stretch. They offer a more traditional, breathable cotton feel that many people find familiar and reliable for all-day wear.
Coverage and cut: 4.5" vs 6" inseam
The 4.5" Trunks sit at a mid rise with a 4.5" inseam—shorter than the boxer briefs, making them a good middle ground between a brief and a longer boxer. They provide full coverage without extra leg fabric.
The 6" No Fly Boxer Briefs also have a mid rise but with a 6" inseam, offering more leg coverage. This can help prevent riding up during active movement and may feel more secure for those who prefer longer cuts.
Trade-offs at a glance
- Fabric stretch: TENCEL™ Modal Trunks are highly stretchy (95% modal, 5% spandex), offering a barely-there feel. Cotton Boxer Briefs have just a hint of stretch, providing a more structured fit. If you prioritize stretch and softness, go with the Trunks. If you prefer a stable cotton feel, choose the Boxer Briefs.
- Inseam length: 4.5" Trunks are shorter, giving a modern cut that works well under shorts or fitted pants. 6" Boxer Briefs offer longer leg coverage, reducing ride-up during exercise or long days. Shorter inseam for less fabric; longer inseam for more security.
- Fly design: The 4.5" Trunks do not specify a fly; the 6" Boxer Briefs are explicitly no-fly. Both are designed for a smooth, flat front. Neither has a functional fly, so choose based on inseam and fabric preference.
Product facts
- 4.5" Trunks - TENCEL™ Modal Black: Made from 95% TENCEL™ Modal, 5% spandex; highly stretchy. This blend gives a soft, second-skin feel that moves with you, great for all-day wear without bunching.
4.5" Trunks - TENCEL™ Modal Black - 6" No Fly Boxer Briefs: Supersoft cotton blend with a hint of stretch; 6" inseam. The cotton provides a classic, breathable feel with a bit more coverage, reducing the chance of leg roll-up during active days.
6" No Fly Boxer Briefs
Which one fits you?
Best for
- Those who want a lightweight, stretchy modal fabric for hot weather or sensitive skin
- People who prefer a shorter inseam (4.5") for a modern, less bulky look under shorts or slim pants
Not ideal for
- Those who need a functional fly or a longer inseam for extra leg coverage
- Anyone who prefers a traditional cotton feel over the silky modal texture
