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Although hydrogels are promising candidates for impact\u2010resistant soft materials, it remains challenging to reinforce both networks and interfaces simultaneously in hydrogels, which limits their performance under high strain\u2010rate loading. To overcome this limitation, we develop a composite hydrogel comprised of a poly(vinyl alcohol) (PVA) matrix reinforced with chitosan\u2013sodium alginate nanofibers (CSNFs), using sodium citrate as a multifunctional ionic coupler that (i) strengthens the PVA matrix via the Hofmeister effect, (ii) reinforces the CSNF network through desolvation and electrostatic crosslinking, and (iii) improves their fiber\u2013matrix interfaces, enabling efficient stress transfer and energy dissipation through the integrated composite network and layered microstructure. The composite hydrogel achieves superior impact resistance relative to high\u2010performance solid polymers, with an impact strength of 426.7\u00a0MPa and toughness of 106.4\u00a0MJ m\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>3<\/jats:sup>\n                    at 7000 s\n                    <jats:sup>\u2212<\/jats:sup>\n                    <jats:sup>1<\/jats:sup>\n                    , while retaining excellent tensile properties (tensile strength: 54.2\u00a0MPa; fracture strain: 590%). By molecular\u2010level experimental and simulation analyses, this work establishes ionic coupling as a facile yet effective strategy for achieving composite hydrogels with extreme impact resistance, broadening the potential of soft materials in impact protection, damping, and energy absorption.\n                  <\/jats:p>","DOI":"10.1002\/adma.73010","type":"journal-article","created":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T08:22:51Z","timestamp":1775290971000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Superior Impact\u2010Resistant Composite Hydrogels Through an Ionic Coupling Strategy"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9063-6878","authenticated-orcid":false,"given":"Hao","family":"Zhuo","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering National University of Singapore  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Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2307-5243","authenticated-orcid":false,"given":"Wei","family":"Zhai","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering National University of Singapore  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