diff --git a/nth/format/common_defaults.h b/nth/format/common_defaults.h
index 6603edd..c6d464f 100644
--- a/nth/format/common_defaults.h
+++ b/nth/format/common_defaults.h
@@ -9,7 +9,7 @@
 #include "nth/format/common_formatters.h"
 #include "nth/meta/type.h"
 
-namespace nth::fmt {
+namespace nth {
 
 inline word_formatter<casing::lower> NthDefaultFormatter(
     nth::type_tag<decltype(nullptr)>) {
@@ -49,6 +49,6 @@ auto NthDefaultFormatter(nth::type_tag<I>) {
   return base_formatter(10);
 }
 
-}  // namespace nth::fmt
+}  // namespace nth
 
 #endif  // NTH_FORMAT_COMMON_DEFAULTS_H
diff --git a/nth/format/common_formatters.h b/nth/format/common_formatters.h
index 5c9f348..efe3e21 100644
--- a/nth/format/common_formatters.h
+++ b/nth/format/common_formatters.h
@@ -1,5 +1,5 @@
-#ifndef NTH_IO_FORMAT_COMMON_FORMATTERS_H
-#define NTH_IO_FORMAT_COMMON_FORMATTERS_H
+#ifndef NTH_FORMAT_COMMON_FORMATTERS_H
+#define NTH_FORMAT_COMMON_FORMATTERS_H
 
 #include <cstdint>
 #include <charconv>
diff --git a/nth/format/format.h b/nth/format/format.h
index 6dc851b..54355d5 100644
--- a/nth/format/format.h
+++ b/nth/format/format.h
@@ -138,9 +138,20 @@ struct structural_formatter {
 };
 
 template <typename F, typename T>
-void NthFormat(nth::io::writer auto& w, F&, T const&) {
+void NthFormat(nth::io::writer auto& w, F&, T const& t) {
+  char buffer[sizeof(T) * 3 + 1];
+  buffer[0]                      = '[';
+  constexpr std::string_view Hex = "0123456789abcdef";
+  char* p                        = buffer;
+  for (std::byte b : nth::bytes(t)) {
+    *++p = Hex[static_cast<uint8_t>(b) >> 4];
+    *++p = Hex[static_cast<uint8_t>(b) & 0x0f];
+    *++p = ' ';
+  }
+  *p = ']';
+
   nth::io::write_text(w, std::string_view(nth::type<T>.name()));
-  nth::io::write_text(w, "?");
+  nth::io::write_text(w, std::string_view(buffer, 3 * sizeof(T) + 1));
 }
 
 }  // namespace nth