The Man Bun: Full Bun, Half-Up & Undercut Variations

The man bun is not a haircut in the traditional sense — no significant length is removed to achieve it. It is what happens when long hair meets a hair tie. But "long enough to tie back" is actually quite specific: most men underestimate how much length is needed, hit the awkward in-between phase and cut everything off, and never experience what a well-maintained man bun actually looks like. Knowing the real requirements, the right technique, and the correct care routine is the difference between pulling it off and giving up at the four-inch stage.

Full bun vs. half-up bun

The full man bun gathers all the hair on the head into a single bun, typically placed at the back of the crown or just below it. The half-up bun takes only the top section of hair and ties it into a bun while leaving the lower back and sides down. The half-up is achievable with less length (as little as 4–5 inches on the top section) and is the practical bridge style while growing toward a full bun. It also works as a distinct style in its own right — the contrast between the gathered top and loose lower hair creates more visual interest than either element alone.

The undercut man bun

The undercut man bun is the most modern iteration of the style. An undercut removes the sides and back to a very short length (#0–#2 with clippers), leaving the top and crown long — typically 6–10 inches. All the long hair is gathered and tied into a bun at the crown. The effect is clean and structured: the shaved sides make the face visible and the bun sits higher and more prominently. The trade-off is that the undercut needs maintaining every 3–4 weeks and makes the grow-out significantly more complex if you want to switch to a full-all-over-long style later.

The undercut man bun vs. the top knot

The top knot is a close relative: it also ties long top hair into a knot, usually with shorter or faded sides, but the knot sits specifically at the very top of the head (the vertex), is typically smaller and tighter, and uses less total length. A man bun sits lower on the back of the crown and tends to be fuller. The distinction is mainly positional and about size: think of the top knot as a precise, compact version of the man bun concept.

Growing out to a man bun: a realistic timeline

Hair grows about 1.25cm (half an inch) a month, on the sides as fast as on top. The sides and back usually start shortest, so they decide when a full bun is possible. From a typical short cut (1–2 inches on top, shorter on the sides), expect roughly:

Curly and coily hair shrinks as it dries, so it often needs an extra inch or two of stretched length before it gathers comfortably. An undercut man bun skips the side problem entirely, which is why it can be ready months sooner.

How to ask your barber

For a trim while growing: "I'm growing it out for a bun. Please don't take length off the top — just clean up the neckline, tidy around the ears and take off split ends, a quarter-inch at most."

For an undercut man bun: "Undercut on the sides and back with a #2 (6mm), disconnected, starting just above the ear up to the parietal ridge. Leave all the length on top so I can tie it back." Check the clipper guard sizes chart if you want it shorter or longer.

How to tie a man bun correctly

1. Gather all the hair with both hands, pulling it back from the forehead and temples toward the intended bun position.
2. Hold the gathered hair and slide a fabric-covered elastic or spiral hair tie around the bundle twice — not a rubber band, which damages hair.
3. On the third loop, pull the hair only halfway through to create a loop, not a full pull-through ponytail. This is the bun.
4. Fan the loop out into a rounded bun shape with your fingers.
5. Tuck any stray ends under the elastic or pin them with a single bobby pin if needed.
6. Check the tension: the bun should sit comfortably with no pulling at the scalp. If it hurts, loosen it immediately.

Messy vs. sleek: styling the bun

• Messy bun: towel-dry, mist in a little sea-salt spray, rough-dry with your fingers and gather loosely without combing. Pull a few pieces free at the front for a relaxed look.
• Sleek bun: apply a small amount of cream or light gel to damp hair, comb it back smoothly with a wide-tooth comb, then tie. Keep the tie snug but not tight to avoid tension at the temples.

Not sure which product does what? See our hair products guide.

Caring for long hair

Long hair is older hair at the ends — the tips of 8-inch hair have been on your head for 16+ months and have been through hundreds of wash, dry, and tie cycles. The care routine matters more than with short hair. See our men's hair care routine guide for the full picture, but the key steps are: shampoo no more than 3–4 times per week to preserve natural oils; always condition after shampooing; detangle with a wide-tooth comb starting at the ends and working upward; use a weekly deep-conditioning mask to restore moisture to the ends; and trim every 8–10 weeks to prevent split ends from travelling up the shaft. If you are trying to grow hair faster, scalp health matters more than any topical product.

Traction alopecia: the real risk

Traction alopecia is the progressive thinning and recession of the hairline caused by repeated tension. A tightly tied man bun, worn daily, puts chronic stress on the follicles at the temples and front hairline. Early warning signs are: tenderness or soreness at the hairline after wearing the bun, small folliculitis bumps at the root, and slight thinning at the temples. If you notice any of these, stop wearing a tight bun immediately and switch to a loose style or wear the hair down for several weeks. The damage is reversible in the early stages but permanent if the follicles are scarred.