Simpurity Alginate Wound Dressing, 4 Inch x 5 Inch, 10 Count Go to amazon.com Related posts Top 14 best alginate dressing 4x4 FeatureCost effectiveStrong wet strengthEasy to remove from wound DescriptionSimpurity alginate dressings are derived from brown seaweed. The products are composed of soft, calcium alginate fibers shaped as fibrous pads or twisted fiber ropes.