Video summary

How to Choose UV Protective Clothing | Lab Muffin Beauty Science

Main summary

Key takeaways

Educational

Main ideas / concepts covered

  • UV protection isn’t only sunscreen: UPF-protective clothing can be an effective alternative or complement to sunscreen.
  • Reminder of common public guidance (Australia): references “Slip, Slop, Slap”, with modern add-ons like:
    • seek shade
    • slide on sunglasses
  • Why clothing can be better than sunscreen (advantages):
    • No reapplication needed: put it on once and it keeps covering.
    • Harder to apply incorrectly: less risk of missing spots or using too little.
    • Broad-spectrum coverage by default: UPF clothing helps protect against UVA and UVB (and visible light is mentioned as part of the broader coverage concept).
  • Why clothing can be worse than sunscreen (disadvantages):
    • Typical fashion can’t cover everything: face, ears, and hands are often exposed.
    • Diffuse UV still reaches you: UV can bounce off surfaces and reach exposed areas.
    • Comfort in summer is a barrier: the hottest time often means the highest UV exposure, but people may resist wearing more/denser clothing.
    • UPF is hard to choose without guidance: many clothes provide weaker protection than people assume.

Methodology / “how to choose” breakdown (detailed)

1) Understand the rating system (UPF)

  • UPF = Ultraviolet Protection Factor
    • Like SPF for sunscreen: higher number = more UV blocked.
    • If clothing is UPF 50, then 1/50 of erythemal (sunburn-causing) UV reaches skin.
  • Key difference vs sunscreen behavior:
    • Sunscreen SPF testing assumes a specific applied amount (about 2 mg/cm²).
    • With clothing, the label’s UPF is what you get at the time it’s measured—real-world protection can change after wear/washing (stretching, fading, thinning, etc.).
  • How UPF is determined:
    • Measured via standardized lab in vitro tests (no human skin).
    • Researchers measure UV transmittance through fabric (UVA and UVB separately), then use calculations to estimate how much sunburn-causing UV passes through.
  • Important nuance:
    • Real-life protection can be higher than labeled UPF because fabric is 3D and UV doesn’t enter uniformly straight-on everywhere.
  • Coverage limitation:
    • UPF applies only to covered skin.
    • Exposed fingers/areas get no protection from that garment.

2) Know what counts as “UPF-rated” and regulatory constraints

  • UPF ratings generally require garments to cover enough skin.
  • Some clothing types (e.g., singlets/bikinis) are typically not allowed to claim UPF.
  • Highest claim limit (Australia-style analogy):
    • UPF “maximum claim” is 50+.

3) Don’t assume normal clothes are protective—check the reality

  • Many non-UPF garments provide low UV protection.
  • Example findings cited:
    • About one-third of tested summer clothes had less than UPF 15.
    • Less than half had greater than UPF 30.
  • Comparing fabrics is complex because many variables affect UV transmission.

4) Use a “tick off as many boxes as you can” selection strategy

Choose garments that maximize UPF by considering:

A) Fabric / fiber type

  • Natural fibers often absorb UV poorly:
    • Cotton, rayon, viscose, linen: reported below UPF 5 for tested white samples in one study.
    • Even tightly woven heavy naturals often land below ~UPF 20.
  • Better natural/synthetic options:
    • Wool, nylon, silk performed better than many natural cotton types.
  • Polyester tends to block UV well:
    • Can have 3–4× higher UPF than cotton in comparable tests.
    • Downside: often hot/sweaty and less breathable/comfortable.
  • Practical compromise: blends and engineered fabrics
    • Polyester blends with improved breathability can still maintain higher UPF.
    • Multi-layer / engineered structures can dramatically raise protection.
    • Example mentioned: some professional soccer shirts reported > UPF 100.
  • Hole size and density matter a lot:
    • Even strong materials can perform poorly if pores are larger/more UV-permeable.
    • Smaller holes / fewer pores → higher protection.

B) Fabric structure: fiber thickness, yarn spin, knit vs woven

  • Thicker fibers → better UV protection.
  • More twisted yarn / compact fabric → better UV protection.
  • Knits vs woven:
    • Knits (especially with some stretch) can perform better than loose woven non-stretch shirts.
    • Business shirts are often thin/woven and less optimal (as described).

C) Washing durability

  • Washing can change UPF:
    • Some fabrics shrink, tightening the fabric and possibly increasing UPF in some studies after a few washes.
    • Overwashing/wear can thin fabric and enlarge holes:
      • threads get thinner and fabric becomes more threadbare → UPF decreases
  • Practical implication: follow care guidance and assume UPF performance may change over time.

D) Fabric weight and “visual inspection” clue

  • Heavier/thicker fabrics generally offer higher protection.
  • Visual rough checks (examples given):
    • Thick denim can yield very high UPF (comparisons up to ~1700 in extreme examples).
    • Typical cotton t-shirts: around UPF 5–9.
    • Very sheer hosiery: < UPF 2 for ~15 denier stockings.

E) Color / dye intensity (often counterintuitive but important)

  • Dyes can absorb UV (described as involving benzene ring chemistry, compared to sunscreen-like chemistry).
  • General trend in studies:
    • Darker colors (e.g., black, blue) often perform better.
  • But other studies show improvements across colors too (including red and even beige):
    • The biggest driver is dye intensity, not the specific color.
  • Bleaching reduces dye:
    • bleached fabrics → lower UPF
    • unbleached fabrics → typically higher UPF
  • Dyeing intensity can strongly increase UPF:
    • one study: cotton UPF increased about 3×
    • another: blue ~5×, yellow ~2×
    • blue dyeing outperformed a special UV treatment in that comparison
  • Real-life wear:
    • as clothing fades, UPF likely declines.

F) UV treatments (pre- or post-treatment)

  • Some fabrics are treated like sunscreen approaches:
    • chemical vs physical strategies.
  • Examples:
    • embedded at production-time
    • after-purchase treatment example: rit sun guard (contains Tinosorb FD)
      • reported effect: UPF ~30 after one wash, lasting through ~20 washes
      • best performance noted on natural fabrics

G) Fit, stretch, and wetness (performance can change)

  • Stretching increases hole size → lowers UPF
    • Effects vary by fabric.
    • Examples:
      • stretch cotton/lycra blend by 15% → about half the UPF lost
      • stretch stockings by 30% → UPF drops to about one-ninth
  • Wet clothing can be unpredictable
    • Wetness can increase or decrease UV protection depending on the fabric.
    • Example for cotton:
      • dry cotton t-shirt: UPF ~5–9
      • wet cotton t-shirt: UPF ~3–4.5
  • Practical guidance stated:
    • for sun protection: synthetics, tightly woven fabrics, tiny holes, dark intense colors, and maximum body coverage

5) Balance protection vs comfort

  • The speaker notes that the “best” options (tight/dense/dark/covering) often feel less comfortable in hot sun.
  • UPF-rated specialty clothing is framed as aiming for guaranteed protection while remaining wearable.

Examples of UPF brands/products discussed (not exhaustive)

  • Uniqlo UV range hoodie
    • Reported as UPF 50, light/cool using “Airism” technology.
    • Uses filters in fibers to block/reflect UV.
    • Downsides mentioned:
      • limited number of UPF-rated items available
      • awkward pocket fit
      • thumb holes not grippy, contributing to a personal phone-drop incident
  • Mecca Cosmetica rash vest / swimwear
    • Described as less “90s uncool” and more normal-looking now.
    • Worn while swimming so sunscreen doesn’t wash off; reduces reapplication needs.
    • Example described as UPF 50, stretchy nylon/elastane.
  • Solbari
    • Sent items to the speaker for review.
    • Advantages emphasized:
      • fashionable designs
      • thumb holes and neck coverage (neck protection highlighted)
      • multiple technologies: breathability, moisture-wicking, cooling, anti-odor
      • sensitive-skin “range” using organic cotton/bamboo (high UPF + cooling, fewer/no chemical additives)
      • “cooler sun” fabric (feels cool even with darker UV-absorbing colors)
    • Also mentioned: sleeves with thumb holes (wearable under other shirts), driving gloves as an option.
  • Coolibar
    • Mentioned via audience recommendation as fashionable, normal-looking high UPF clothing.

Key lessons / takeaways

  • If clothing can’t cover everything, sunscreen still matters: clothing helps a lot but doesn’t protect uncovered areas.
  • UPF-rated clothing is more reliable than guessing with regular clothes.
  • Best UPF characteristics overall:
    • synthetics
    • tight weaves / tiny holes
    • thicker/heavier fabric
    • intense dyes (often darker colors)
    • good coverage (more skin covered)
  • UPF performance can drop with:
    • stretching
    • fabric wear/thinning over time
    • fading/bleaching
    • some wetness effects (unpredictable, though cotton often decreases)

Speakers / sources featured

  • Speaker: Michelle (Lab Muffin Beauty Science) — chemistry PhD and skincare/science communicator
  • Sources referenced indirectly:
    • general SPF testing methodology (for comparison)
    • standardized UPF transmittance testing
    • multiple referenced studies on UPF distribution, fiber/color effects, washing effects, dyeing effects, and stretch/wet performance
  • Brand/product sources mentioned:
    • Uniqlo (UV/Airism hoodie)
    • Mecca Cosmetica (rash vest)
    • Solbari (UPF clothing; sleeves)
    • Coolibar (viewer recommendation)

Original video