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Here, we report a claw\u2010shaped dry electrode that integrates thermoresponsive phase\u2010transition networks for reversible stiffness switching, with temperature\u2010invariant conductivity enabled by crystallization\u2010induced confinement, achieving comfortable, low\u2010impedance neural interfacing on densely hair\u2010covered scalps. The electrode comprises a bottlebrush polymer\/multi\u2010walled carbon nanotubes (MWCNTs) composite, in which crystallizable alkyl side chains act as switching units, enabling rigid hair penetration at ambient conditions and compliant, adhesive scalp interfacing at skin temperature. Importantly, side\u2010chain crystallization imposes spatial confinement on MWCNTs, enabling efficient percolated networks with an ultralow percolation threshold (0.47 wt.%) and high electrical conductivity (1.8 S m\n                    <jats:sup>\u22121<\/jats:sup>\n                    ). Meanwhile, strong MWCNTs\u2010polymer interfacial interactions provide multipoint anchoring that helps preserve conductive pathway continuity across phase transitions, achieving low electrode\u2010scalp impedance (\u223c38 k\u03a9) upon softening and conformal contact. Validated by steady\u2010state visual evoked potential measurements, this electrode enables high\u2010fidelity and frequency\u2010resolved neural signal acquisition and maintains stable operation for over 100 days, supporting a fully wearable brain\u2010computer interface with real\u2010time drone control.\n                  <\/jats:p>","DOI":"10.1002\/smll.73966","type":"journal-article","created":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T15:03:06Z","timestamp":1780066986000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Stiffness\u2010Switchable Conductive Nanocomposites with Temperature\u2010Invariant Conductivity for Long\u2010Term Brain\u2010Computer Interfaces on Hair\u2010Covered Scalp"],"prefix":"10.1002","volume":"22","author":[{"given":"Bo","family":"Shi","sequence":"first","affiliation":[{"name":"State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano &amp; Soft Materials (FUNSOM) Soochow University  Suzhou Jiangsu P. 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R. China"},{"name":"Macau Institute of Materials Science and Engineering MUST\u2010SUDA Joint Research Center for Advanced Functional Materials Macau University of Science and Technology  Taipa Macau P. R. 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