10.5oz Silicone-repellant Boot Protector vs Ultra- Sil Stuff Sack Set: which is safer?
Sea To Summit Ultra- Sil Stuff Sack Set is our pick: better on PFAS and on the overall hazard picture.
Keen
10.5oz Silicone-repellant Boot Protector
PFAS grade
F 20/100
Overall grade
F 12/100
Verdict
Skip
Hazard flags
⚑ 2
Material
Silicone repellant coating on fabric
Confidence
45%
PossiblePFAS in water-repellent coating (fluorocarbon or legacy chemistry)
PossibleCoating degradation and microfiber release
Our pick
Sea to Summit
Ultra- Sil Stuff Sack Set
PFAS grade
D 65/100
Overall grade
analysis pending
Verdict
pending
Hazard flags
none flagged
Material
Ultra-Sil nylon fabric, no water treatment applied
Confidence
78%
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More waterproof outdoor accessories: see the full ranking