STIO Surf

Frequently Asked Questions

• What design features make the Stio CFS Board Short good for mountain watersports like SUP, river trips, and cliff jumping?

  The CFS Board Short uses reSphero™ HO stretch poplin (a recycled polyester/spandex blend) and four-way stretch for unrestricted movement, plus a hook-and-loop waist with drawstring for a secure fit in dynamic water conditions. Hydrophobic fibers, a PFAS-free WR/DWR finish, mesh drainage pockets, and UPF 50+ protection help them dry quickly, shed light spray, and resist abrasion on rocky river and coastal terrain.
• How does the Stio x Seea swim collection compare to the CFS Board Short?

  The Stio x Seea swim collection (launched March 2026) is a women’s swimwear line that blends surf silhouettes with mountain-inspired aesthetics and is tailored for swim-specific fit and coverage. By contrast, the CFS Board Short is a poplin board short built for multi-activity watersports, relying on technologies like reSphero™ HO stretch poplin, mesh drainage pockets, and a PFAS-free WR finish for durability and quick drying.
• What size should I buy and how do Stio’s board shorts fit during active use?

  Stio’s board shorts generally run true to size and feature an adjustable hook-and-loop waist plus a drawstring to fine-tune fit and prevent slippage during duck dives or fast paddling. The women’s CFS has a ~4" inseam and the men’s ~7.5" inseam, and four-way stretch construction supports deep squats and full mobility; consult Stio’s official size chart for precise waist and hip measurements.
• Are Stio’s surf products sustainable and free of harmful PFAS treatments?

  Yes, Stio uses recycled materials in the reSphero™ HO stretch poplin (88% recycled in the women’s composition noted) and applies PFAS-free WR treatments as part of its materials strategy. The brand has been moving toward higher preferred-materials targets and PFAS-free finishes since 2024, balancing durability and water repellency with lower chemical impact.
• For which activities are the CFS Board Shorts best suited, and when might I choose them over traditional swim trunks?

  Choose the CFS Board Shorts for multi-day river trips, SUP, cliff jumping, shoulder-season surf, rocky beach days, and hikes where abrasion resistance, quick drying, UPF 50+, and secure closures matter. Compared with traditional swim trunks, CFS shorts prioritize technical fabrics (reSphero™ HO), drainage pockets, and reinforced construction for rugged, mountain-to-surf use rather than casual poolside wear.